Here is a list of classic older games that have been remade and where to download them:

• Hedgewars - A great worms clone
• OpenRA - Open source engine with Red Alert mods etc. in the vein of Command and Conquer. (active)
• OpenTTD - For lovers of Transport Tycoon. (active)
• FreeCiv - Civilization clone. Also, the Online Version. (active)
• The Ur-Quan Masters - Star Control 2. Site hasn't been updated in quite a while, but you can download the game and check the forums for any additional information. (inactive)
• Theme Hospital - Open source clone of Theme Hospital, currently in Beta4 (active)
• UFO:AI - Squad-based tactical strategy game in the tradition of the old X-COM PC games. (active)
• Wormux - Worms clone. (active)
• Simutrans - like Transport Tycoon. (active)
• FreeCol - A turn-based strategy game based on the old game Colonization (active)
• The Silver Lining - unofficial continuation to the King's Quest series created by fans. (active)
• King's Quest - King's Quest remakes.
• Warzone 2100 - Warzone game. (active)
• Planet M.U.L.E. - free remake of M.U.L.E. (active)
• Risen3D - Doom port, check the readme.
• Hedgewars - Worms clone. (active)
• Resident Evil 1.6 - A fan remake.