There are many sites where you can get information about previous releases, those that are in progress, and those that will be released soon. Most are sites established during the ICO boom in 2016-2017, so the information is consistent and very detailed in most cases. Keep in mind that there are many more similar sites, but the older ones are always more reliable.
These are some of the ones I visit frequently:
IcoDrops.
ICODROPS has been my favorite website since a long time ago, I always look at the ICO details on icodrops and see what projects will appear soon and at lunching.
There have even been more ICO projects in the past that have made great profits and most of them have been quite successful, even though some are also scams and have never been listed on any market.
2016-2017 was quite an impressive time, earning a lot of BTC and ETH very easily that time.
Maybe I have worked on hundreds of projects through airdrops and bounties and I also entered for investation on some projects that were quite good and made profits even thousands of percent at that time.