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Proton Bridge (CLI only) packaged for SailfishOS. Also includes a systemd service which you can enable using:

systemctl --user daemon-reload (only the first time)
systemctl --user start proton-bridge.service

Note that the way it works is pretty idiotic and you have to stop it before you can configure it:

systemctl --user stop proton-bridge.service

Then you can get configuring:

proton-bridge --cli

libfido2 provides library functionality for FIDO U2F and FIDO2 protocol communication with authenticators.

ImageMagick® is a software suite to create, edit, compose, or convert
bitmap images.
It can read and write images in a variety of formats (over 200) including
PNG, JPEG , GIF , HEIC ¹, TIFF, DPX, EXR ¹, WebP , JPEG2000 , WMF ¹, AVIF ¹, CR2 ¹,
jbig ¹, JPEG XL ¹ , Postscript ¹, DJVU ¹, PDF ¹ and SVG.
ImageMagick can resize, flip, mirror, rotate, distort, shear and transform
images, adjust image colors, apply various special effects, or draw text,
lines, polygons, ellipses and Bézier curves.

cURL is a tool for getting files from HTTP, FTP, FILE, LDAP, LDAPS,
DICT, TELNET and TFTP servers, using any of the supported protocols.
cURL is designed to work without user interaction or any kind of
interactivity. cURL offers many useful capabilities, like proxy support,
user authentication, FTP upload, HTTP post, and file transfer resume.
It contains the tools curl and wcurl

libcurl:
This package provides a way for applications to use FTP, HTTP, Gopher and
other servers for getting files.

Manage Proton Mail Bridge on Sailfish OS.

Start or stop the Bridge service, check its status, and add, view, or remove Proton accounts directly from the app.

Requires a paid Proton plan with Bridge support.

Unofficial third-party app; not affiliated with Proton AG.

Events view widget showing a custom shell command output.

Convert gnome settings between binary conf files and json

(dependency for ThemeColor)

CallKey triggers gates, doors, and other devices by placing predefined SIP calls.

Configure the SIP server, credentials, target number, transport, network settings, and call timeout for each action. Frequently used actions can be launched directly from the app cover. Passwords are stored using Sailfish Secrets.

Source code: https://github.com/RikudouSage/harbour-callkey
Translations: https://app.transifex.com/rikudou-sage/callkey

Native find-my-device app for Sailfish OS: see your device's last position on a map and control it remotely via MQTT or SMS — fully self-hosted, no Google or cloud account involved.

A native Immich application for Sailfish OS
Source code: Github project
Thread in Sailfish forums:  Sailfish forums