diff --git a/network/castor/README b/network/castor/README
new file mode 100644
index 0000000000..011e8c84f1
--- /dev/null
+++ b/network/castor/README
@@ -0,0 +1,6 @@
+Castor is a graphical client for the Gemini, Gopher
+and Finger protocols.
+It's written in Rust and uses GTK.
+
+Home page: https://git.sr.ht/~julienxx/castor
+
diff --git a/network/castor/castor.SlackBuild b/network/castor/castor.SlackBuild
new file mode 100644
index 0000000000..8fa3178687
--- /dev/null
+++ b/network/castor/castor.SlackBuild
@@ -0,0 +1,172 @@
+#!/bin/bash
+
+# Slackware build script for castor
+
+# Copyright 2022 Julien Blanchard, Bordeaux France
+# All rights reserved.
+#
+# Redistribution and use of this script, with or without modification, is
+# permitted provided that the following conditions are met:
+#
+# 1. Redistributions of this script must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
+#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+cd $(dirname $0) ; CWD=$(pwd)
+
+PRGNAM=castor
+VERSION=${VERSION:-0.9.0}
+BUILD=${BUILD:-1}
+TAG=${TAG:-_SBo}
+PKGTYPE=${PKGTYPE:-tgz}
+
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i586 ;;
+    arm*) ARCH=arm ;;
+       *) ARCH=$( uname -m ) ;;
+  esac
+
+  if [ "$ARCH" = "i586" ]; then
+    if rustc -Vv | grep host | grep i686 > /dev/null ; then
+      ARCH=i686
+    fi
+  fi
+fi
+
+# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
+# the name of the created package would be, and then exit. This information
+# could be useful to other scripts.
+if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
+  echo "$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE"
+  exit 0
+fi
+
+TMP=${TMP:-/tmp/SBo}
+PKG=$TMP/package-$PRGNAM
+OUTPUT=${OUTPUT:-/tmp}
+
+if [ "$ARCH" = "i586" ]; then
+  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
+  CARGOTARGET="--target i586-unknown-linux-gnu"
+elif [ "$ARCH" = "i686" ]; then
+  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
+  CARGOTARGET="--target i686-unknown-linux-gnu"
+elif [ "$ARCH" = "x86_64" ]; then
+  SLKCFLAGS="-O2 -fPIC"
+  CARGOTARGET="--target x86_64-unknown-linux-gnu"
+else
+  SLKCFLAGS="-O2"
+  CARGOTARGET=""
+fi
+
+set -e
+
+rm -rf $PKG
+mkdir -p $TMP $PKG $OUTPUT
+cd $TMP
+rm -rf $PRGNAM-$VERSION
+tar xvf $CWD/$VERSION.tar.gz
+cd $PRGNAM-$VERSION
+
+# build offline
+# configuration tells cargo to use the configured directory
+# for dependencies instead of downloading from crates.io
+mkdir .cargo
+cat << EOF >> .cargo/config
+[source.crates-io]
+registry = 'https://github.com/rust-lang/crates.io-index'
+replace-with = 'vendored-sources'
+
+[source.vendored-sources]
+directory = '$(pwd)/vendor'
+EOF
+
+# deps and versions come from Cargo.lock
+mkdir vendor
+(
+  cd vendor
+
+  grep -h -A 3 "\[\[package\]\]" $(find ../ -maxdepth 1 -mindepth 1 -name Cargo.lock | tr '\n' ' ') | \
+    sed 's/[[:space:]]*=[[:space:]]*/=/g;s/^--//;s/^\[\[/--\n[[/' | \
+    awk 'BEGIN { RS = "--\n" ; FS="\n" } { print $2, $3, $4 }' | sed 's/"//g;s/name=//;s/ version=/=/' | \
+    grep crates\.io-index | sed 's/ source=.*$//' | sort -u | while read -r dep ; do
+
+    ver="$(printf "%s\n" "$dep" | cut -d= -f2)"
+    dep="$(printf "%s\n" "$dep" | cut -d= -f1)"
+
+    echo "HERE $ver $dep"
+
+    tar xvf $CWD/$dep-$ver.crate
+
+    touch $dep-$ver/.cargo-ok
+
+    # generate checksum
+    {
+      printf "{\n"
+      printf '    "files": {\n'
+
+      (
+        cd $dep-$ver
+        find . -type f -print0 | xargs -0 sha256sum | sed -n '/\.cargo-checksum\.json/!p' | sed 's/\.\///;s/^\([^ ]*\)[[:space:]][[:space:]]*\(.*\)$/"\2":"\1",/'
+      ) | sed '$ s/,$//'
+
+      printf "    },\n"
+      printf '    "package": "'
+
+      sha256sum "$CWD/$dep-$ver.crate" | cut -f1 -d' ' | sed 's/$/"/'
+
+      printf "}\n"
+    } > $dep-$ver/.cargo-checksum.json
+  done
+)
+
+chown -R root:root .
+find -L . \
+ \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
+  -o -perm 511 \) -exec chmod 755 {} \; -o \
+ \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
+  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
+
+CARGO_HOME=.cargo \
+CFLAGS="$SLKCFLAGS" \
+CXXFLAGS="$SLKCFLAGS" \
+cargo build --release $CARGOTARGET
+
+mkdir -p $PKG/usr/bin/
+
+find target -name $PRGNAM -exec install -m 755 {} $PKG/usr/bin/$PRGNAM \;
+
+find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
+  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true
+
+mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
+cp -a LICENSE README.md $PKG/usr/doc/$PRGNAM-$VERSION
+cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
+
+mkdir -p $PKG/usr/share/applications
+install -m 644 data/Castor.desktop $PKG/usr/share/applications
+
+mkdir -p $PKG/usr/share/icons/hicolor/{scalable,16x16,32x32,64x64,128x128}/apps
+install -m 644 data/org.typed-hole.castor.svg $PKG/usr/share/icons/hicolor/scalable/apps/org.typed-hole.castor.svg
+install -m 644 data/org.typed-hole.castor-16.png $PKG/usr/share/icons/hicolor/16x16/apps/org.typed-hole.castor.png
+install -m 644 data/org.typed-hole.castor-32.png $PKG/usr/share/icons/hicolor/32x32/apps/org.typed-hole.castor.png
+install -m 644 data/org.typed-hole.castor-64.png $PKG/usr/share/icons/hicolor/64x64/apps/org.typed-hole.castor.png
+install -m 644 data/org.typed-hole.castor-128.png $PKG/usr/share/icons/hicolor/128x128/apps/org.typed-hole.castor.png
+
+mkdir -p $PKG/install
+cat $CWD/slack-desc > $PKG/install/slack-desc
+cat $CWD/doinst.sh > $PKG/install/doinst.sh
+
+cd $PKG
+/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE
diff --git a/network/castor/castor.info b/network/castor/castor.info
new file mode 100644
index 0000000000..d151aa6be3
--- /dev/null
+++ b/network/castor/castor.info
@@ -0,0 +1,226 @@
+PRGNAM="castor"
+VERSION="0.9.0"
+HOMEPAGE="https://git.sr.ht/~julienxx/castor"
+DOWNLOAD="https://git.sr.ht/~julienxx/castor/archive/0.9.0.tar.gz \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/aho-corasick/aho-corasick-0.7.18.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/ansi-parser/ansi-parser-0.6.5.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/atk/atk-0.8.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/atk-sys/atk-sys-0.9.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/autocfg/autocfg-0.1.8.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/autocfg/autocfg-1.1.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/bitflags/bitflags-1.3.2.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/cairo-rs/cairo-rs-0.8.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/cairo-sys-rs/cairo-sys-rs-0.9.2.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/cc/cc-1.0.73.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/cfg-if/cfg-if-0.1.10.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/cfg-if/cfg-if-1.0.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/cloudabi/cloudabi-0.0.3.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/core-foundation/core-foundation-0.7.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/core-foundation-sys/core-foundation-sys-0.7.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/dirs/dirs-3.0.2.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/dirs-sys/dirs-sys-0.3.7.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/foreign-types/foreign-types-0.3.2.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/foreign-types-shared/foreign-types-shared-0.1.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/form_urlencoded/form_urlencoded-1.0.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/fuchsia-cprng/fuchsia-cprng-0.1.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/futures-channel/futures-channel-0.3.21.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/futures-core/futures-core-0.3.21.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/futures-executor/futures-executor-0.3.21.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/futures-io/futures-io-0.3.21.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/futures-macro/futures-macro-0.3.21.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/futures-task/futures-task-0.3.21.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/futures-util/futures-util-0.3.21.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/gdk/gdk-0.12.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/gdk-pixbuf/gdk-pixbuf-0.8.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/gdk-pixbuf-sys/gdk-pixbuf-sys-0.9.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/gdk-sys/gdk-sys-0.9.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/getrandom/getrandom-0.2.6.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/gio/gio-0.8.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/gio-sys/gio-sys-0.9.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/glib/glib-0.9.3.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/glib-sys/glib-sys-0.9.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/gobject-sys/gobject-sys-0.9.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/gtk/gtk-0.8.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/gtk-sys/gtk-sys-0.9.2.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/idna/idna-0.2.3.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/lazy_static/lazy_static-1.4.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/libc/libc-0.2.125.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/linkify/linkify-0.7.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/log/log-0.4.17.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/matches/matches-0.1.9.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/memchr/memchr-2.5.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/native-tls/native-tls-0.2.4.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/nom/nom-4.2.3.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/once_cell/once_cell-1.10.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/open/open-2.0.3.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/openssl/openssl-0.10.40.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/openssl-macros/openssl-macros-0.1.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/openssl-probe/openssl-probe-0.1.5.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/openssl-sys/openssl-sys-0.9.73.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/pango/pango-0.8.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/pango-sys/pango-sys-0.9.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/pathdiff/pathdiff-0.2.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/percent-encoding/percent-encoding-2.1.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/pin-project-lite/pin-project-lite-0.2.9.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/pin-utils/pin-utils-0.1.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/pkg-config/pkg-config-0.3.25.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/proc-macro2/proc-macro2-1.0.38.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/quote/quote-1.0.18.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/rand/rand-0.6.5.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/rand_chacha/rand_chacha-0.1.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/rand_core/rand_core-0.3.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/rand_core/rand_core-0.4.2.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/rand_hc/rand_hc-0.1.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/rand_isaac/rand_isaac-0.1.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/rand_jitter/rand_jitter-0.1.4.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/rand_os/rand_os-0.1.3.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/rand_pcg/rand_pcg-0.1.2.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/rand_xorshift/rand_xorshift-0.1.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/rdrand/rdrand-0.4.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/redox_syscall/redox_syscall-0.1.57.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/redox_syscall/redox_syscall-0.2.13.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/redox_users/redox_users-0.4.3.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/regex/regex-1.5.5.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/regex-syntax/regex-syntax-0.6.25.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/remove_dir_all/remove_dir_all-0.5.3.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/schannel/schannel-0.1.19.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/security-framework/security-framework-0.4.4.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/security-framework-sys/security-framework-sys-0.4.3.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/serde/serde-1.0.137.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/serde_derive/serde_derive-1.0.137.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/slab/slab-0.4.6.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/smawk/smawk-0.3.1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/syn/syn-1.0.94.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/tempfile/tempfile-3.0.8.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/textwrap/textwrap-0.14.2.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/thiserror/thiserror-1.0.31.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/thiserror-impl/thiserror-impl-1.0.31.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/tinyvec/tinyvec-1.6.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/tinyvec_macros/tinyvec_macros-0.1.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/toml/toml-0.5.9.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/unicode-bidi/unicode-bidi-0.3.8.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/unicode-linebreak/unicode-linebreak-0.1.2.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/unicode-normalization/unicode-normalization-0.1.19.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/unicode-width/unicode-width-0.1.9.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/unicode-xid/unicode-xid-0.2.3.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/url/url-2.2.2.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/vcpkg/vcpkg-0.2.15.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/version_check/version_check-0.1.5.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/wasi/wasi-0.10.2+wasi-snapshot-preview1.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/winapi/winapi-0.3.9.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/winapi-i686-pc-windows-gnu/winapi-i686-pc-windows-gnu-0.4.0.crate \
+          https://crates-io.s3-us-west-1.amazonaws.com/crates/winapi-x86_64-pc-windows-gnu/winapi-x86_64-pc-windows-gnu-0.4.0.crate"
+MD5SUM="296a3a901fea3d632661878a395758fa \
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+        74634128440dbc3766bda76fdf0aaa05 \
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+        09de9d01e7331ff3da11f58be8bef0df"
+DOWNLOAD_x86_64=""
+MD5SUM_x86_64=""
+REQUIRES=""
+MAINTAINER="Julien Blanchard"
+EMAIL="julien@typed-hole.org"
diff --git a/network/castor/doinst.sh b/network/castor/doinst.sh
new file mode 100644
index 0000000000..7bb20ae58a
--- /dev/null
+++ b/network/castor/doinst.sh
@@ -0,0 +1,6 @@
+if [ -x /usr/bin/update-desktop-database ]; then
+  /usr/bin/update-desktop-database -q usr/share/applications >/dev/null 2>&1
+fi
+if [ -x /usr/bin/gtk-update-icon-cache ]; then
+  /usr/bin/gtk-update-icon-cache -q usr/share/icons >/dev/null 2>&1
+fi
diff --git a/network/castor/slack-desc b/network/castor/slack-desc
new file mode 100644
index 0000000000..660ec98b6b
--- /dev/null
+++ b/network/castor/slack-desc
@@ -0,0 +1,19 @@
+# HOW TO EDIT THIS FILE:
+# The "handy ruler" below makes it easier to edit a package description.
+# Line up the first '|' above the ':' following the base package name, and
+# the '|' on the right side marks the last column you can put a character in.
+# You must make exactly 11 lines for the formatting to be correct.  It's also
+# customary to leave one space after the ':' except on otherwise blank lines.
+
+      |-----handy-ruler------------------------------------------------------|
+castor: castor (gemini client)
+castor:
+castor: Castor is a graphical client for the Gemini, Gopher
+castor: and Finger protocols.
+castor: It's written in Rust and uses GTK.
+castor:
+castor: Home page: https://git.sr.ht/~julienxx/castor
+castor:
+castor:
+castor:
+castor: