FluffyChat - Open. Nonprofit. Cute ?
Call2friends - High-quality cheap and free international calls online to any mobile or landline numbers from internet and free calling app - cheaper than other VoiP providers. Try it now!
Olvid - The most secure messaging app in the world.
Make Free Calls Online - Make Free Calls Online is a web application that, as the name suggests, allows its users to make international and local calls for free.
Molly (Signal fork) - Molly is an independent Signal fork for Android
Poptox - Poptox is a web application where you can communicate with people in every corner of the world.