I've read through the legal information and there doesn't seem to be any constraints against mixing SRD main and d20 Modern SRD, but I wanted to double check hoping someone here might know better. I'm currently in the works of making a computer game using the OGL.
Am I allowed to mix the two?
To explain why I would want to do such a thing: I would like to take the Psion class from SRD main and add it as an option into my game along with the point system. I've never played or ran a game with a psion-class in it. Are there problems I should watch out for? Especially if I'm mixing it along with d20 Modern basic classes?