Software Finder

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Telegram
Android, iOS, Linux, Mac OS, Web Application, Windows, Windows AppAlternatives

A simple and secure communication app that's open source and synced across multiple devices.

 instant-message, voice-message, group-chat, encrypted-chat    Internet Tools, Instant Messaging Client    Free
Editor Rating:
4
Trillian
Android, Blackberry, iOS, Linux, Mac OS, Web Application, WindowsAlternatives

A cross-platforms IM client with multiple protocols support and eye candy design.

 instant-message, voice-message, group-chat, encrypted-chat    Internet Tools, Instant Messaging Client    Free (Limited features)
Editor Rating:
3.5
Miranda IM
WindowsAlternatives

An instant messenger with support for multiple protocols and the most intensive set of plugins and customizations.

 instant-message, voice-message, group-chat, encrypted-chat    Internet Tools, Instant Messaging Client    Free (Open source)
Editor Rating:
3
Pidgin
Linux, Mac OS, WindowsAlternatives

An open-source multi-protocol IM program with clean and simple design.

 instant-message, voice-message, group-chat, encrypted-chat    Internet Tools, Instant Messaging Client    Free (Open source)
Editor Rating:
3.5