It's been a long time since I sat down and went through the Free OSR Lists on the right side of this page to see what is missing and what has dropped off.
If you have a moment, I ask that you check out the links. You might find stuff that you don't have. Heck, you might find stuff that I don't have listed. If that's the case, drop a link or two in the comments below.
Here are the links to the pages:
Free OSR Rulesets - Other (needs entries)
OSR Resources (needs entries, and I can already think of a few)
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