FluentCloud - FluentCloud V3 Management Interface
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
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.
Jabber - Jabber.org is an IM service based on XMPP and one of the key nodes on the XMPP network.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.