We currently offer a massive range of downloads for FSX, as well as older flight simulator add-ons for the ever-popular FS2004, FS2002, CFS3 and now becoming ever popular with dediced virtual aviators is Laminar Research's X-Plane series.
SamDim has just released their Yak-42 as freeware. This add-on for FS9 is a complete package including a quality model, a super-realistic panel, a genuine soundset and has the proper flight dynamics. The 3D model was initially developed for a payware package, it contains all kinds of animations controlled by the panel. A virtual cockpit is not included due to possible payware plans for in the future. The panel and the flight dynamics were developed by a group of flightsim enthusiasts from Lvivin the Ukraine working for Lviv Airlines which uses the Yak-42. Most of the systems are implemented and there is a constant feedback from the real Yak-42 pilots. For more information please visit the SamDim product page.