I know I love
In the Emperor's Name for playing rules-light skirmishes in the
40K universe, and I am currently pondering ways to make it a larger game. Currently it's a game of alternating activations, but actually in each
phase of Movement, Shooting, Hand-to-Hand, etc., rather than a complete set of game phases with each unit.
It's rules-light, so there are easy creation rules for all sorts of fighters, any types of weapons you want to port in from
40K, infantry armor and vehicles.
Unfortunately the gameplay gets cumbersome with more than 10-12 figures per player. I want a system that's about the size of a 1500 pt
WH40K 2nd edition game, where you might see a player fielding two units of Space marines, a Hero, and a Dreadnought on the field as a complete force.
I have been pondering, and I think that if each alternation activated a
unit, instead of a single figure, things might actually balance out right there. There's even a bare-bones system for making vehicles, which would suffice for the types of vehicles such a small skirmish would see (like a Marine or Eldar bike/jetbike).
There have been tons of generic rulesets ever since Stargrunt And Stargrunt II in the 80's and 90's. Stargrunt II is completely free to download, but is pretty rules crunchy in that time-period's style of wargames, which I unfortunately dislike.
http://www.boardgamegeek.com/boardgame/5686/stargrunt-ii
As said before several generic "open source" rulesets I have been meaning to check out are:
-Tomorrows War
-Gruntz
-both Scifi and Fantasy settings of Song of Blades and Heroes
etc.
The best part about generic rule systems is they don't have to be the Games Workshop-esque juggernaut. They are for people who are in it for the social aspect of gaming, as well as for the figures. The best rulesets are the ones that provide a fun game, but without overshadowing the two previous things. I love
40K for the universe and the figures. I only play
40K because it's the "familiar" option. On the other hand, I
hate the tomes of rules and tedious collections of
FAQ's that are required to play in my favorite sci-fi universe with the figure I love.