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.
Molly (Signal fork) - Molly is an independent Signal fork for Android
Textnow.com - It lets you text your friends, aka my only source of happiness
Olvid - The most secure messaging app in the world.
TeleGuard - TeleGuard is a secure messenger that makes it store that your data or chats are not stored while collaborating or communicating with partners and friends.