Elegant Facebook Messenger desktop app
Caprine is an open-source, cross-platform, and privacy focused Facebook Messenger desktop app built with Electron.
Franz 2.0 is a desktop app that puts messaging services altogether in one place. It can combine apps like WhatsApp, Slack, Facebook Messenger, WeChat, HipChat, Skype and a lot more. You can even use multiple accounts for the Facebook Messenger - mix your business profiles and your private ones if you need to.
A powerful Twitter client based on TweetDeck.
Tweeten is a column-based interface that helps you keep track of everything that's happening on Twitter without needing to hit the refresh button.