wavemon is a wireless device monitoring application that allows you to watch signal and noise levels, packet statistics, device configuration and network parameters of your wireless network hardware. It should work (though with varying features) with all devices supported by the Linux kernel.
Available in the OpenWRT package repo.
Signal Stickers is a community-organized, unofficial directory of sticker packs for Signal, the secure messenger. All content on this website is copyrighted by their respective owners. This website is not affiliated with Signal or Open Whisper Systems.
If you're looking for blobcats or other stuff to throw into your group chats, start here. Installation is simple, visit the site from your mobile and it'll engage Signal's installation mechanism.
A daemon which implements an API bridge to the Signal network. This is for hooking bots into the Signal messaging network as well as connecting other kinds of software and webhooks in.
A daemon that implements the Signal protocol. You have to interact with it through the UNIX socket it opens. You can either register a brand-new phone number for this daemon or add it to the one you already have.
In the AUR.
An implementation of Textsecure/Signal in Golang as a CLI tool. Can send and receive one-to-one and group messages.
A web application that sits in front of a command line Signal client that lets you send messages from a web browser. Seems to also have a REST API. Requires a second phone number to set up an account, it's not an extension to an existing Signal setup. Looks like all-Docker-all-the-time but it looks like you can also run it as a system service (a systemd .service file is in the docs, and it says nothing about using Docker for that).
Interestingly, it's a couple of shell scripts.
A tool which interfaces with Signal on behalf of one of your devices to send text messages. Designed for use in scripts. Written in Java, in the AUR, I probably already have it installed on Leandra.
A script which uses the Signal CLI utility to send secure messages.
A voice inversion descrambler (and scrambler). Can invert live signals in realtime. Has commonly used inversion carriers as presets.