Smooch.io for Facebook Messenger - Message your customers from Slack, Front, a bot or anywhere!
statuspage - A simple self-hosted status page site with an API written in Django under the BSD license.
Pullstring - Powering computer conversation across all platforms.
FreshStatus - Better status pages in 1-click, FREE FOREVER
Conversity - Easiest way to manage Facebook Messenger chats
Avaya one-X Agent - Other Customer Service