The X-Wing Alliance Upgrade Project is a graphical update to the Lucasarts flight sim X-Wing Alliance. This, combined with other mods, will allow you to play through X-Wing, Tie Fighter, X-wing Vs. Tie Fighter, and X-wing Alliance with upgraded graphics, and improved gameplay mechanics. Other customized missions can be found onder the "addon" section.
The more detailed model is made by G_T, Dragon, and Enterprise-E, while the other one was made by totally games, back in the 90's.