Avalance Games offers the third edition of its Panzer Grenadier board game as a free download. There’s a lot of assembly, but its a good way to try it out with minimal cash investment.
WWII
Beer and Pretzels WWII Micro Armor
GHQ has a pdf of its Beer and Pretzels WWII Micro Armor, originally a commerial set, now a set of free wargames rules.
OP Art – Operational Rules For WWII Eastern Front
Op Art is a set of rules for operational level games on the Eastern Front of WWII. The author writes:
Operational Art is the term first coined by the Russians to describe the level oc fomat that falls between the tactics used on the battlefield and the strategic direction of a war. The basic units of manoeuvre are division sized formations and the decision making level is that of army commander.
The rules have been designed so that players can recreate battles fought at this level; as a result a degree of abstraction has been included in the mechanisms used and especially in the way in which combat is resolved.
Panzer Gruppe WWII Rules
Panzer Gruppe is a set of free wargames rules for corps/army sized battles in World War II.
RKAA Brigade Commander Rules
RKAA Brigade Commander is a set of free wargames rules for brigade sized encounters in World War II on the Eastern Front.