WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Textnow.com - It lets you text your friends, aka my only source of happiness
WhatsGreen Multi Messenger - Easy access to WhatsApp, Line, Telegram, FB Messenger and many others via the Chrome toolbar.
aTalk - An encrypted instant messaging with video call and GPS features for android.
Sesame Chat - A Self-Aware, Digital Assistant that Protects Your Messages
Molly (Signal fork) - Molly is an independent Signal fork for Android