RetroShare is described as 'Open source cross-platform, private and secure decentralized communication system. It lets you to securely chat, share photos, videos, and more, using OpenPGP to authenticate peers and ' and is a very popular Video Calling app in the social & communications category. There are more than 100 alternatives to RetroShare for a variety of platforms, including Windows, Linux, Mac, Android and iPhone apps. The best RetroShare alternative is Signal, which is both free and Open Source. Other great apps like RetroShare are LocalSend, Element, Discord and Tox.