D&D 4e ruleset

[Miniton]

I am sorry if this is posted somewhere already, but I tried searching for the answer.
Is there a D&D 4e ruleset available and where do I find it?
I see a lot of people mentioning it and even showing tutorials, so I guess I am missing it somewhere.

Thanks in advance for your help,
Miniton

[VenomousFiligree]

The ruleset is hosted at Four Ugly Monsters (https://www.fouruglymonsters.com/), specifically try the D&D 4th Edition FG Development Group (https://www.fouruglymonsters.com/index.php?option=com_groupjive&task=showgroup&groupid=20).