CS educators collaboration communities? What are collaboration sites for CS teachers?
The CS Educators StackExchange is nice'n'friendly, but here are some topics I'd like to be discussed, which are outside of StackExchange policy:

case studies: show to others direct experience when teaching a class
honest skill transfer efficiency for a specific methodology, the real percentage of students who &quot;got it&quot; and became programmers or got computational thinking
practice set tasks, which were used alongside main course
collection of programming problems, which student found &quot;interesting&quot; and which turned students into love/understanding with programming
collection of bad practice problems, which made more frustration than learning benefit

So far I haven't found any centralized resources except this StackExchange, but maybe there are others? I struggle now because I have to create practice task set for my course and really can't use the knowledge of precious generation of teachers, as information is highly decentralized.
Strangely, just after posting a question I found a list of additional link collections:

https://github.com/zamansky/awesome-cs-education
https://github.com/quobit/awesome-python-in-education
https://cseducators.stackexchange.com/a/3947/9632

And one chat:

https://chat.stackexchange.com/rooms/59174

I still think there should be more, but this is a start.