SkyOS

The project reached the height of its popularity in 2004, when Szeleney decided to close the source of SkyOS and begin work on the fifth version. At the beginning of the year, Szeleney started a paid beta program to fund development and distribution of the OS, expecting to have very few (if any) interested subscribers. At the same time, members of the community hosted a contest to determine the look of the GUI, which drew significant attention to the project. So much attention, in fact, that by the end of that same year, the SkyOS community had tripled in size, and Szeleney had hundreds of active beta testers downloading and testing his twice-monthly releases.