jGameBase - jGameBase is a fully-featured retro-gaming emulator frontend and game database utility.
Twidere - Tired of seeing ads and promotions in your timeline, being disrupted by tweets from bots and people...
Z26 - Z26 is one of the best emulators for the Atari 2600.
Hyperspace Mastodon client - Hyperspace offers a clean, fast and responsive client for the Mastodon social network
Javatari - Javatari is a multiplayer Atari 2600 emulator written in pure Java with no external libs.
Pinafore - An alternative web client for Mastodon, focused on speed and simplicity.