Ring4 - Manage business phone line as easily as you manage emails, in the cloud. Ring4 provide you with a business line and video conferencing solution.
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
Burner - Disposable phone numbers -- now with MMS photo support
Keybase Chat - End-to-end encrypted chat built into Keybase
quackr - Protect your privacy & identity with quackr. Use our free temporary phone numbers to receive SMS online now.
Crypho - End-to-end-encrypted messaging and file sharing