Cannot find a site D:
There used to be one website, where you could learn Japanese or Mandarin via blog notes, emails and some tasks. It was more like... Well, an email game? It had lots of slang and colloquial words... Maybe some of you know about what website I'm writing right now ( TT___TT )
The site you provided (Gratis Global) has all the top quality materials (websites and apps) that you need to learn most languages, and I happen to have most of the top apps they recommended before I even discovered this site today. It's a great compilation for people learning languages for free or for less cost. Glad you shared it here!