Adamant Messenger - The most secure and anonymous messenger, encrypted with Blockchain
Geneva - An all-in-one communication app for groups & communities
Sonar - 2-way chat with your customers over SMS and FB Messenger
Textedly - Textedly is an SMS marketing communications channel that allows to advertise, promote, announce, and engage with audience through text messaging directly to cell phones.
Twilio for Slack - Enable SMS conversations with Slack+Twilio
BlueReceipt - Text marketing customers love ❤️