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

TinkerTool - Tinker with the hidden settings of your Mac

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

Onyx by Titanium - This website provides operating system utilities for macOS

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

Cocktail - General purpose system modify/repair utility