Best Django Open Source Project for Intermediate Django Learners

I have gone through official Django Poll app tutorial, Django Girls tutorial, and several simple examples. 

Could anyone recommend one or several best open source Django project for people like me to ramp up the django skills further?

Some good one I have heard about is as follows:

NewsBlur

Everyblock

However, these projects are huge. Any medium size, easily accessible projects available?

Thanks.

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