HelpScout - Help Scout is a simple, straightforward way to provide excellent support

Unapp - A directory of minimal and useful single-purpose apps.

Zendesk - Zendesk is a beautiful, lightweight help-desk solution.

BotList - An app store for bots

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

Slack App Directory - Your go-to for finding apps that work with Slack