This was taken from the Whonix wiki before Pidgen was depreciated. FYI Tor messenger is now depreciated by upstream dev
Pidgin supports most protocols. However do not use it. It has a very bad security track record with many remotely exploitable bugs - a result of being written in C and containing many legacy protocols. There is no reason to use it when Tor Messenger is now available.
You can go with Gamjum for Whonix 13, then Ricochet for Whonix 14.
May also be of interest to you for Whonix 14…
https://forums.whonix.org/t/a-secure-replacement-for-pidgin/2057