Grammarly - Clear, effective, mistake-free writing everywhere you type.
Songstack - Swipe to discover new music for Spotify
GrammarChecker.net - Grammar Checker is an online spell check tool. It effectively works on English sentence correction, Punctuation mistakes of 28 other different languages.
Gnoosic - Even if you don't know what you are looking for - gnod will find it.
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
mixmello - mixmello is a free, open source tool to create remixed versions of your favourite playlists.