We had, until 2014 (?) a good thread with a list and simple classification of Altcoins.

That seems not more possible at the moment with >1000 coins. But people would be surprised by the little amount of diversity regarding code bases. Most altcoins (>90%, even 95%) are clones without substantial modifications to Bitcoin's, Litecoin's or Peercoin's code.

What I would appreciate would be a kind of "genealogy site" (or thread) pointing out the origins of every cryptocurrency. (For example: Cygnus -> Clone of Peercoin with few additions -> Clone of Bitcoin with PoS addition and new diff algorithm). So we could classify altcoins in "families" and it would be easier to see for newbies if an altcoin has really innovation or not.