TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
Worklife Slackbot - Your personal meeting assistant, in Slack
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.
Navigator - The Teamwork assistant — run great meetings without busywork
TextMe - TextMe is a free calls and messaging application at both local and international levels.
Typewise - The next generation keyboard