A Drop Too Many is an interactive storytelling game by Jim Wallman. It’s truly a unique concept, and worth taking a long look.
Rules: WWII
Entrenched WWI Rules
Entrenched is a set of free wargames rules for games set in the First World War.
Axis and Allies Miniatures Rules
Wizards of the Coast releases its Axis and Allies game today. The rules are available for free. You can get the quickstart guide or the advanced rules.
Seas of War WWII Naval Wargames Rules
Stephen Lorenz offers a new set of WWII naval wargames rules called Seas of War. The set is professionally done and presented in pdf format. It also includes the data on a huge number of ships of the period.
A Terrible Resolve Midway Rules
Matt Fritz has these free wargames rules for gaming the Battle of Midway. The rules are designed for 1/700 ship and airplanes models but Matt also provides paper counters and airplanes.