Elegant Facebook Messenger desktop app
Franz is a free messaging app for services like WhatsApp, Slack, etc,
Desktop client for Facebook Messenger
A Node client for the Facebook Messenger Platform
PinoyChat: The International Chatroom App for Desktop
Go Gmailer is a java based desktop app to send emails.
Stay in touch with all your friends on Skype, FB, G+, ICQ in one app.
A micro-app which can help you use Big Troll emotions in Facebook chat