From where we can know about develeopers of projects?Their past history?Their projects completed on time in past or not?Basically their reputation?
I think this forum and any other of its kind is the best place unless you personally know any well-wishers who work in real estate. Here biased opinions can be challenged when they are posted.
Google is a good option in particularly bad cases because you might be able to find something fishy about the developer or the project.
You can always contact agents dealing in the project to ask them such things but take whatever they tell you with a huge pinch of salt.