Any game that does not have the hubris to decide how I should run my group with preachy socio/political leanings baked into the rulebooks are my favourite: screw real-world cultural manifestos, I just want to play your damn game.
Definately green without a doubt (more so for the author's viewpoint(s). The written work I would regard as 'written like it doesn't give a crap what anyone else thinks'):
Kort'thalis Publishing
Green by being neutral or indifferent to divisive social politics (haven't seen anything to say otherwise. Maybe I'm wrong?):
BRW Games
Arion Games
Anything TSR AD&D 1e and earlier (yes I know it's WOtC, so I guess a debate about written work vs. current publisher owner here, so just go buy OSE or OSRIC to get your fix I guess)
There are a few much smaller outfit examples that would also be green I think, but these are the main ones I can think of off the top of my head.