Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
chompSMS - chompSMS is a communication app developed and published by Delicious for Android and iOS devices.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
biteSMS - You love your iPhone as much as we do? You text all the time? Want more features?
HelpScout - Help Scout is a simple, straightforward way to provide excellent support