Gajim

Gajim is a fully-featured XMPP client that lets you chat freely with friends and family. Choose your preferred provider and sync conversations across all devices while enjoying interoperability with many other chat apps. Share pictures, thoughts, and files securely using state-of-the-art end-to-end encryption. Organize groups for communities or events, and express yourself with reactions, replies, voice messages, and status updates. All these features come completely free, ensuring your conversations remain private and accessible wherever you go.