As far as increasing test, I think I'd have to say that only avena sativa an muara puama have been shown to do so. (MAYBE, trib will, indirectly) Well, and prohomones yeah, but the side effects outweigh the benifits so they're a non issue IMO.
The problem is, there haven't been many in-depth studies on this, but the ones I've seen seem to be objective -- as opposed to the bullshit studies that some supplement companies conduct. The imperical evidence is also very strong, which in many ways is the best evidence of all. But as I said, I want to do some blood tests. I forgot who is was, but someone on this board did a blood test check and it did indeed show a higher free T count from the use of avena.
Post cycle therapy is a three pronged procedre IMO. You need to block e, (but not too much) detoxify the liver, and get Mr. Johnson back in action as soon as possible. So milk thistle, r-ala, chrysin and MACA would head the list with some xanthoparmilia added to fortify the "bonerfication" factor.
Again, no natural substance is going to work like a drug but even if you decide to use HCG,or clomid or whatever, I think it's best to add some nutritional support so maybe you won't need quite as high a dosage of the drugs. The more "naturally" you can recoup and stabilize, the better off you'll be. And the sooner you'll be ready for your next cycle.