RoomForTea - A female-friendly housing network in London, UK.
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.
tripcake - Doodle for travel plans with friends
Babble - A more personalized social network
Magpie - Female travelers club - meet women like you when you travel
LanguageBeast.com - Study English synonyms and antonyms to enrich your vocabulary