how do you distinguish good ICOs from scam ICOs?

[Domithra]

any trick for detecting that?

[Zed0X]

Each has their own guide. Most I've seen starts with those listed ICO review sites, pick those that interest them and review further.   

[investwarrior]

Good icos usually have verified team in listings plus open erc20 token so we can check all transfers and they have open smartcontracts for public in github.

[KobbyC]

One thing for sure is to check the URL if it is secured. Most URL's with the LOCK sign is 80% real. Wierd URL's, I won't waste my time. The whitepaper is also very critical in checking for real ICO. Most scammers don't do any proper writings and designs.

The qualification of the team is also a key. Most of the times, project managers who use Avatars and no social media information and do not share any proper information about themselves are not all that to be trusted.

The website of the project is another factor to check of. Shun websites which will give an input for credit card and passwords.

[ZionRTZ]

There is none that I know. Maybe some basic guides. Always know who the team behind the project is and what they are trying to achieve. Assess if they can actually deliver.

[CryptoDan]

Good ICOs are run by established companies managed by experienced professional with actual track record. A good example is the recently launched VLUX - http://vlux.io/