Origin, with its On the House program, has been releasing games for free, to promote their distribution platform. This time, they dug deep in the back catalog and pulled out Wing Command 3: Heart of the Tiger. This DOS-era game is the last of the three focused on "The Confederation" versus "The Kilrathi". It was also the first to use "full motion video", headlined by Mark Hamill, rather than animated cutscenes. "On the House" makes it free forever, if you declare your interest before the promotion ends.
It is also available at Good Old Games, for $5.99, but it does go on sale from time to time. At the very least, it is probably worth picking it up on Origin and, if you like it, pick up the DRM-free version at GoG.com for safe archival.
And if you don't like it? Well, you're not out much, are you?