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.
WhatsApp Web To Go - WhatsApp Web client for your phone/tablet with media support
Voice Swap - Live voice changer & face filters for video selfies.
Promote Route - A Better WhatsApp™ Experience
Voxer - Turn your phone into a Walkie Talkie. Don't waste time on phone calls and voicemails.
LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.