As far as games with working Windows ports, there are quite a few. One great example is an open source project called "Vega Strike" (http://vegastrike.sf.net), which is like a Wing Commander clone. It's currently in development, but the latest version is quite playable. There is also FreeCiv (http://www.freeciv.org), a free Civilization clone, which have been very stable for a while. It's mostly compatible with both the Civ 1 and Civ 2 rule sets. ZAngband (http://www.zangband.org), a free open-source AngBand (which is similar to nethack or rogue) variant is also quite mature, with many features beyond most similar games.
Last, but not *quite* least, is "Freespace 2", 1999's Space Combat Sim of the Year (sequel to the 1998 Space Combat Sim of the Year, Descent: Freespace), while it probably doesn't meet the regular criteria for "open source", it's source was released to the public some time ago (http://www.freespace-2.com/ddn/sources/freespace2/), and ongoing development by third parties (http://icculus.org/freespace2/)(http://www.3dap.c om/hlp/hosted/fsscp/) has produced some rather nice results. While the game itself is not free, the fact that it's source has been opened and it's such a spectacular example of a game, it might be something to possibly consider.
There are numerous others that I haven't mentioned because I haven't used personally, but there are many linux-based Open-Source games that have native Win32 ports available that would be simple enough to use.
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As far as games with working Windows ports, there are quite a few. One great example is an open source project called "Vega Strike" (http://vegastrike.sf.net), which is like a Wing Commander clone. It's currently in development, but the latest version is quite playable.
2 /), and ongoing development by third parties (http://icculus.org/freespace2/)(http://www.3dap.c om/hlp/hosted/fsscp/) has produced some rather nice results. While the game itself is not free, the fact that it's source has been opened and it's such a spectacular example of a game, it might be something to possibly consider.
There is also FreeCiv (http://www.freeciv.org), a free Civilization clone, which have been very stable for a while. It's mostly compatible with both the Civ 1 and Civ 2 rule sets.
ZAngband (http://www.zangband.org), a free open-source AngBand (which is similar to nethack or rogue) variant is also quite mature, with many features beyond most similar games.
Last, but not *quite* least, is "Freespace 2", 1999's Space Combat Sim of the Year (sequel to the 1998 Space Combat Sim of the Year, Descent: Freespace), while it probably doesn't meet the regular criteria for "open source", it's source was released to the public some time ago (http://www.freespace-2.com/ddn/sources/freespace
There are numerous others that I haven't mentioned because I haven't used personally, but there are many linux-based Open-Source games that have native Win32 ports available that would be simple enough to use.