Talk360 - Talk360 is a best-in-class communication utility that offers a convenient way to connect with loved ones globally.
FluffyChat - Open. Nonprofit. Cute ?
Textnow.com - It lets you text your friends, aka my only source of happiness
aTalk - An encrypted instant messaging with video call and GPS features for android.
Molly (Signal fork) - Molly is an independent Signal fork for Android
Dingtone - Dingtone is a free call and texting application for making unlimited calls and text messages to any number at the moment registered in any part of the world by any cellular company.