Linphone

A secure VoIP tool that you can use for free

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

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

Feature-rich communication platform for virtual meetings, HD video conferences, team chat, and VoIP calling

Instant messaging and calling app for multiple platforms

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

Version of the popular open-source instant messaging software