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.

Media.io - Media.io has all the handy tools you need for video & audio converting (.mp4, .mp3, .mov, .mkv, .avi, .wav, etc.) and editing, like generating auto subtitles, applying engaging text, music, effects, templates.

Synonymful - Improve your vocabulary and communicate like a pro.

Universal Word - Translate YouTube subtitles into multiple languages

Fluent - Fluent is a people-based marketing platform that uses real-time, one-to-one interaction to create custom audiences and serve personalized ads that drive performance at scale.

Subtitle Generator - Subtitle Generator will automatically create subtitles for your YouTube videos and translate them into other languages.