Grammarly - Clear, effective, mistake-free writing everywhere you type.

Authorly - Read | Write | Explore - Connecting Authors

Linguix - AI-enabled writing tool for writers, editors, and businesses

Kludd.co - Everyone writes.

Typosaurus - Quickly check your website for spelling errors

Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.