https://itunes.apple.com/us/app/onion-browser/id519296448?mt=8

https://guardianproject.info/apps/orweb/

https://play.google.com/store/apps/details?id=org.thoughtcrime.securesms

https://itunes.apple.com/us/app/chatsecure-encrypted-secure/id464200063?mt=8

https://play.google.com/store/apps/details?id=org.thoughtcrime.securesms

https://itunes.apple.com/en/app/groundwire-business-caliber/id378503081?mt=8

https://play.google.com/store/apps/details?id=com.csipsimple