Arkham Investigator is a free paragraph based game that uses many of the same mechanics as the old Sherlock Holmes: Consulting detective game.
Building A Wilderness Outpost
Terrainthralls has a nice tutorial on building a wilderness outpost which could be used in a variety of settings.
Retro 8 Bit Games
Retrospec has a selection of 8-bit games that have been updated for modern computers.
Redcoats and Dervishes
Redcoats and Dervishes is a set of free wargames rules for playing games set in the period of Great Britain’s involvement in Egypt and the Sudan.
Shieldwall Fantasy Rules
Shieldwall is a set of free wagames rules for 6 – 8 figures, using a dice pool mechanism. It is short, but well done.