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This list is old :)

What are some obvious additions the list is missing since it's old?

It was updated on 9 August. That isn't too old.

Nop, check the stats of Caffe for instance: https://github.com/BVLC/caffe

This is much older than the 9th of August.

It is 20/11819 = 0.16% stars off. It isn't old, just not automatically updated.

Ah, it was when it got posted to HN! Count was ~9K.