TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
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.
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