WordCounter.net - Count words, sentences, paragraphs etc.

Preply - Large database of experienced English language tutors. Native speakers. Flexible payment system

TryDiff - Free online text comparison tool. Compare two texts side-by-side with character-level highlighting. Find differences instantly. 100% private.

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.

Diff Checker - Diff Checker is a free online diff tool that quickly and easily gives you the text differences...

Babbel - Babbel is a paid language learning service that aims to strike a balance between thoroughness and cost efficiency.