Twire - Free and open Twitch browser and stream player
Xtra - a Twitch player and browser
GNOME Twitch - Enjoy Twitch on your GNU/Linux desktop
Frosty - A mobile Twitch client for iOS and Android with 7TV, BetterTTV (BTTV), and FrankerFaceZ (FFZ) support. Built with Flutter.
Orion Desktop - QML/C++-written cross-platform desktop client for Twitch.tv
DankChat - DankChat is a simple to use the application to chat on Twitch.tv that comes with reliable features to have streamline conversations between the two users.