Retroshare establish encrypted connections between you and your friends to create a network of computers, and provides various distributed services on top of it: forums, channels, chat, mail… Retroshare is fully decentralized, and designed to provide maximum security and anonymity to its users beyond direct friends. Retroshare is entirely free and open-source software. It is available on Android, Linux, MacOS and Windows. There are no hidden costs, no ads and no terms of service.
Retroshare is a very interesting tool with a lot of potential. It is listed as a way of sharing files trade-free in this article: https://www.tromjaro.com/share-files-trade-free/ – I am not aware of any trades, even the website has none, that’s why I give 5/5 blocks.