Rambox gives you the possibility to add common services many times you need, all in one place. It's perfect for people who work with many services for business and private accounts. hot
Peerscape is a peer-to-peer social network that you can use to share photos and such with your family and friends. It is an application that you run on your personal computer and interact with using a web browser.
Ramme is an unofficial open source Instagram desktop app made with Electron.
Wire open source secure messenger.