Both twitter and telegram announcements and crypto bot app are good for monitoring your coins for during ico. If it's in an exchange already i use etherscan for the rough estimate of the coin value. But etherscan is somewhat limited, if that's the case i usually resort on checking it on coinmarketcap. Although some project will state where the coins would be listed. But overall, coinmarketcap is the best answer.
Thanks mate, however the problem comes with coins that do not provide a significant marketcap yet. For instance, I was looking to invest in Themis Network post ICO, but realized way too late that it was already trading on HitBTC and IDEX below ICO-price. Once I realized, it was already too late.
Since the market cap was/is too low, it was not listet on CMC.
That's why I'm asking if there was a site that keeps track of all listings. Also of smaller coins. Regards.