Gajim

Feature-rich XMPP messaging client offering tabbed chats, file sharing and extensive customization options

Lightweight LAN messenger for encrypted chats, file transfers, and desktop capture with zero configuration

The popular messaging application for Facebook users

Lightweight messaging client for seamless chats, group conversations, and media sharing across synced devices

Comprehensive collaboration hub for chat, video meetings, and managing remote teams in one place

Well-rounded VoIP software that enables free communication using any modern device

Version of the popular open-source instant messaging software