Free open source instant messenger software compatible with XMPP / Jabber, IRC, Bonjour, Gadu-Gadu, Novell GroupWise, Lotus Sametime, SILC, SIMPLE and Zephyr. Available for Linux, BSD, Mac and Windows.
Fediverse address:
@pidgin@fosstodon.org
Tagged: IRC
Thunderbird
The popular free open source desktop email app, available for Linux, Mac and Windows. As well as email, it also works as an RSS news reader, XMPP client and IRC client.
Fediverse account (main):
@thunderbird@mastodon.online
Fediverse account (videos):
@thunderbird@tilvids.com