Grammarly - Clear, effective, mistake-free writing everywhere you type.
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Hunspell - Hunspell is the spell checker of LibreOffice, OpenOffice.
Manuskript - Open-source tool for writers.
DSpellCheck - Yet Another Notepad++ Spell-checking Plug-In
FocusWriter - FocusWriter is a fullscreen, distraction-free word processor designed to immerse you as much as...