RetroShare

RetroShare is a secure, decentralized communication system that brings several forms of communication and content sharing into one program. It supports decentralized chat for conversations, decentralized forums for longer discussions, and decentralized messaging for exchanging messages through the same system. It also provides file transfer, giving users a way to exchange content alongside their conversations and discussions. The program is intended for people and groups that want these functions within a decentralized structure rather than spread across separate tools. RetroShare can serve as an open source replacement for Slack when the main needs are chat, messaging, discussion forums, and file exchange. However, it should not be assumed to be a feature-for-feature substitute. Its stated capabilities are limited to those communication and sharing functions, and its decentralized design means it has a different underlying structure from the kind of communication service users may expect when replacing a paid product.