Thunderbird
4.0 uit 5 sterre (gebaseer op 2 resensies)
Mozilla Thunderbird is a free and open-source cross-platform email client, personal information
tag: XMPP client
Gajim
5.0 uit 5 sterre (gebaseer op 1 resensie)
A fully-featured XMPP client – Connect to your contacts using a server of your choice.