Gajim

Gajim is a fully-featured XMPP client that lets you chat freely with friends, family, and groups. Choose your preferred provider and sync conversations across all devices while enjoying interoperability with other chat apps. Share pictures, thoughts, and files securely with state-of-the-art end-to-end encryption ensuring only your intended contacts see your messages. Build communities around shared interests, organize events through groups, and express yourself with reactions, replies, voice messages, and status updates. All these features come completely free, putting you in control of your communication.