Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Grammarly - Clear, effective, mistake-free writing everywhere you type.
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
Hunspell - Hunspell is the spell checker of LibreOffice, OpenOffice.
HelpScout - Help Scout is a simple, straightforward way to provide excellent support
DSpellCheck - Yet Another Notepad++ Spell-checking Plug-In