Where can I find a resource that will let me look up the name of something (mostly mechanical) and find out which supplement it came from? I don't need stats or anything else that is restricted, just a place to start looking.
I'm thinking an article in the resource would read something like:
First appearence: PhB
Subsequent appearences: Splat book 2B, Dragon magazine X-Y
Does something like this exist? Bonus points if it's free.
I'm pretty sure with the way the GSL works, the compendium is about all you're going to get unless someone has personally put one of these together. Which if they have, it won't be long before WotC sends a C&D letter along with other various legal implications their way.
In my 2+ years of obsessing over 4e, I do not believe something like this exists. You can use the search function on the D&D site but even their search function sucks, perhaps browse the archive by category? Best of luck to you!