I didn't mention, Colossus v2 (COL2) is now replaced by Colossus NXT (COLX). You can trade it on Tradesatoshi and Coinsmarkets. Coinsmarkets has half of global volume for the coin. Unfortunately, the exchange experiences a lot of technical issue. Personally, I wasn't able to log in even though I had created and validated my account.

Worth mentioning there are also some coins on Nova Exchange which will close next April '18.