Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
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.
Anchor CMS - Free and lightweight blogging system
Memrise - Learn a new language with games, humorous chatbots and over 30,000 native speaker videos.
Textpattern - Textpattern is an elegant content management system that is free, open source software.
Busuu - Join the global language learning community, take language courses to practice reading, writing, listening and speaking and learn a new language. Learn English with busuu's .