7 open-source Messengers projects

Messengers (Online Service Revivals): open-source projects that exist because someone reverse engineered a closed product, sorted by GitHub stars.

1. Hotline (mierau)★ 767 · active · Swift

   Modern Hotline client for macOS and iOS that speaks the classic Hotline protocol

2. Mobius★ 192 · active · Go

   Hotline server reimplemented in Go, compatible with classic Hotline clients

3. aim-oscar-server★ 85 · slowing · Go

   Server that provides AIM OSCAR services to old AIM clients

4. mrim-server★ 73 · active · JavaScript

   Mail.ru Agent (MRIM) server emulator

5. MSNPSharp★ 9 · dormant · C#

   MSNPSharp library patched to connect to the Escargot MSN Messenger revival

6. msnclient★ 6 · dormant · JavaScript

   Library to connect to the Escargot MSN Messenger revival server

7. Yumeko★ 3 · dormant · JavaScript

   Yahoo! Messenger service emulator for old Yahoo Messenger clients