Grammarly - Clear, effective, mistake-free writing everywhere you type.
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Typely - A sensitive, unobtrusive and reliable tool for any writer, newspaper editor, teacher, blogger or student STA
Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
editorr - Get instant writing help from real editors.
Words For That - the reverse-Urban Dictionary of the internet