Miranda NG - https://miranda-ng.org/
- Supports from Windows XP to Windows 11 (Windows only client)
Pidgin -
https://pidgin.im/ - Supports various
OS. Windows, FreeBSD, Linux, MacOS and etc.
Conversations -
https://codeberg.org/iNPUTmice/ - Supports only Android. Can
be downloaded from Google play or from
F-Droid.
Siskin IM -
https://siskin.im/ - Supports
only iOS. Can be downloaded only in App Store. |