All the user created lessons/courses in one place [not finished]
As you can tell by the very few lessons these are only a few of the user created lessons on Duolingo. So please help by leaving a link to the lesson in the comments. And I will add them as soon as possibly. :)
Hi, you might want to take a look at a similar page on the unofficial Wiki: http://duolingo.wikia.com/wiki/User-created_lessons
If you know of user-created lessons that aren't included there, you could update it. That would be pretty great!
I think Tinycards decks will be too numerous to put into an index (here) without a search function (particularly as the title is All the user created ..., and all the Tinycards decks amounts to rather a lot). And as the Tinycards decks come with their own search function anyway, it seems pointless to try and recreate an index with a search function.
However, if there are decks which you yourself think are high quality, or would like a personal list of decks which you have found useful towards a particular end, I think that making such a list would be a good thing, and sharing such useful lists of decks could be great.
TseDanylo creates Mandarin Chinese lessons. I'm sorry that I don't know how to create links on my computer, but if you search their post Mandarin Chinese Lesson Directory you should be able to find them.