3CX

Enterprise messaging and VoIP solution enabling unified calls, video meetings, and team collaboration anywhere

Feature-rich open-source Telegram client offering multi-account support, enhanced privacy, and flexible media playback

Instant messaging and calling app for multiple platforms

Fast, privacy-focused messaging with massive group chats, broadcast channels, and simple, intuitive design

The popular messaging application for Facebook users

Version of the popular open-source instant messaging software

Free, browser-based video conferencing platform emphasizing strong encryption, privacy, and essential collaboration features