Worklife Slackbot - Your personal meeting assistant, in Slack
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
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
Talkatone - Android App on. Google Play. Stop paying for cell minutes, texts & landlines; Turn your iPad or iPod touch into a phone; Call/Text even in areas with bad cell coverage; Call/Text when travelling without paying for expensive international minutes.