HelpScout - Help Scout is a simple, straightforward way to provide excellent support
Unapp - A directory of minimal and useful single-purpose apps.
HelpNinja - Simple & Affordable help desk
BotList - An app store for bots
SupportYourApp - Connecting talented people with the blooming IT industry to help them grow faster by outsourcing support.
Slack App Directory - Your go-to for finding apps that work with Slack