As EFV pointed out, there is no reasonable way to show, definitively, what other partners can access. However, in general, it is reasonable to assume that awards for one airlines would be mostly available to all its partners (including non-alliance partners). There are, of course, lots of exceptions, but it is practical to plan awards with the assumption that all partners have the same availability.

For those edge cases, you will have to read through the trove of information on FT. Airlines are not going to publicize availability differentials, so mostly we will have to rely on user reports.

To help, I do have a tips page in ANX that tries to summarize some of my own observations about the quirks of each mileage programs.