From the sheer volume of posts that I see lamenting how god awful Games-Workshop is at writing a ruleset that is both fun, fluffy, balanced, streamlined and with a high degree of strategic depth, and the near equal volume of follow up posts that describe with confident certainty, exactly the kinds of changes that need to be made to achieve these aims, I'm assuming that there must be quite a few rulesets out there that achieve all of these aims gracefully.
Anyway, what are some of the better/more popular/well known homebrew rulesets for Warhammer
40k?