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I would say Anki is well establish, has a large user base, also free and receives updates often.

Anki is free software - this is far from being a replacement.

Also anki3 is the replacement. Its rather modern and python base is well written and documented.

By anki3 do you mean anki 2.1.xx that uses python 3 or anki v3?

I don't see any tags or branches on the github repo that indicate anki v3.

What makes it outdated, what is missing?