Ancient Battlefields is a set of free wargames rules "with an emphasis on Command and Control". The game is over when the opposing general flees the field.
Miniatures Rules
Caliburn’s Wrath Arthurian Rules
Caliburn’s Wrath is a set of free wargames rules from Matt Cappetta for the Arthurian period. The rulesCaliburn’s Wrath are “intended to represent intense clashes between small bands of foot soldiers.”
Starship Comparison Charts
How big is a Stardestroyer compared to a Romulan D’deridex? Which is bigger, a Vorlon cruiser, or Farscape’s Moya? This great site has size comparisons of the great ships from science fiction.
Starship Troopers For Dirtside
Here are some rules for using the Dirtside II system to recreate battles from Heinlein’s Starship Troopers.
Star Trek Counters
The Heavy Metal Wargaming site has some counters for use in starship games set in the Star Trek: The Next Generation universe.