I've found No-Intro for everything not disc based. Also, I've gotten 1 Tosec, but it was disc based and didn't have duplicates. I also only had massive duplicate problems with GoodSets. As for what each thing means, it's in the GoodSet readme's. [b] mean Bad or Incorrect Rip, [h] means hacked (either rom hack, translation or otherwise), [t] means trainer... I forget what p and o are. There might even be [t] for Translated and [h] doesn't quantify Translated.
Yea... unless you wanna sift through all of that. I also recently got the eXoDOS set... it was huge. It was however A LOT of DOS games... like 600GB worth.