aTalk - An encrypted instant messaging with video call and GPS features for android.
FluffyChat - Open. Nonprofit. Cute ?
Talk360 - Talk360 is a best-in-class communication utility that offers a convenient way to connect with loved ones globally.
Olvid - The most secure messaging app in the world.
Molly (Signal fork) - Molly is an independent Signal fork for Android
Mi Airit - Mi Airit a chat app that helps you communicate messages to the right people without receiving unwanted responses or reactions.