Grammarly - Clear, effective, mistake-free writing everywhere you type.
Teachable - Create and sell beautiful online courses with the platform used by the best online entrepreneurs to sell $100m+ to over 4 million students worldwide.
Hunspell - Hunspell is the spell checker of LibreOffice, OpenOffice.
PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
DSpellCheck - Yet Another Notepad++ Spell-checking Plug-In
Clever - syncing between education applications for K-12 schools