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

HelpCrunch Knowledge Base - Deliver instant answers to customers 24/7 with help articles

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

Stonly Knowledge Base - Interactive knowledge bases and help-centers

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

Slab - Slab is a knowledge hub for the modern workplace. We help teams unlock their full potential through shared learning and documentation. Slab features a beautiful editor, blazing fast search, and dozens of integrations like Slack, GitHub, and G Suite.