What's Forge?
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https://forge.fantasygrounds.com/
Register yourself and add your the ruleset there. When you update it anyone who has subscribed will automatically pick up the update. I published a couple of little modules for Call of Cthulhu there.
Judge Dredd will go out of print in February - maybe their license expired? EN Publishing has a deep sale on all Judge Dredd books, also on DriveThruRPG.
Probably, but I'd like to move to Forge as that looks like a more robust way to keep it updated.