Why only for memecoin and shitcoins? Coinmarketcap and coingecko already can supply you that. But Im not sure if there are sites that focus only on this but instead providing general or all infos on different coins and tokens they listed.

In some telegram group there are signals and update but for a site that only look on that not really sure. There is category anyway on coingecko for different group might wanna check if there is shitcoin list only.