Caprine is an open-source, cross-platform, and privacy focused Facebook Messenger desktop app built with Electron.
With Rambox you will need to worry about messaging and privacy no more! It is a platform that will let you combine your emailing and messaging applications into one. Every session you log in expires at the moment you log out, so you don't worry about your privacy and meanwhile, you can lock it if you want to spend some time away from your computer.
Messenger Lite is a slimmed down version of Messenger that offers the core features of Messenger for markets with slower than average internet speeds and a prevalence of basic Android smartphones.