I checked a few of the sites...
I use the "SkyGuide TravelDesk" which is available at no charge and includes most airlines. It does not include most LCC though. It's a cooperative effort between American Express and GoldenWare Technologies.
version that I checked appears to be the older version of the TravelDesk program by Goldenware.
Skyteam version appears to be a version of the newer SkyGuide TravelDesk program, but limited to the SkyTeam Alliance.
I always keep the SkyGuide on my computers for planning purposes and have been using the TravelDesk and later SkyGuide for several years now. The SkyGuide is great, but I miss some of the things unique to TravelDesk.