TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
FluffyChat - Open. Nonprofit. Cute ?
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.
Olvid - The most secure messaging app in the world.
TextMe - TextMe is a free calls and messaging application at both local and international levels.
Molly (Signal fork) - Molly is an independent Signal fork for Android