Aside from doing your own research to identify potential ICO scams there are resources available for free, such as ICO tracker, that provide warnings concerning current ICOs and future ICOs.

There is also a platform call Cofound.it of which it is said that they preselect only viable ICOs.

Cofound.it is a token sale (ICO) accelerator that aims to grow into a platform for crowdsourcing token sale services. Cofound.it will work directly with project teams to develop tokenized products and services and fund them with a token sale. As they deepen their expertise in the process, Cofound.it wants to build an open marketplace for token sale service providers, such as PR companies, blockchain developers, community managers, legal advisors, and due diligence investigators.
https://www.smithandcrown.com/sale/cofoundit/

https://coinmarketcap.com/currencies/cofound-it/

https://cofound.it/en/

It's an interesting and promising idea. I've discovered it in a video made by @initforthemoney:

NINE SOLID REASONS TO BUY COFOUND.IT (CFI)