Tim Miller wrote an interesting one page review of four alternative operating systems. Not the usual suspects (Ubuntu, SUSE or Linspire) around but rather obscure ones.
First on the list, we have SkyOS, which is a limited band proprietary OS with limited software and hardware support but exciting prospects ahead.
It is still in beta version (its tenth year). It has garnered a faithful following and promises a rather different Operating System experience when it launches. In the meantime though, you will have to spend $30 to join the beta program.
The second OS reviewed is BeOS's descendant, Haiku. BeOS was once hailed as the next MacOS, as it is/was heavily multimedia friendly. However like SkyOS, BeOS is still in perpetual beta version even if a growing number of open source software is adapted to run on it.
Next is Syllable which is not for the faint hearted as its installation is MS-DOSesque, read text-based. Syllable suffers from the same problems as SkyOS and Haiku.
Finally, the last one on the list is Visopsys, which one might call, HobbyOS. According to Newsforge, Visopsys will be particularly useful when used as a hard disk partitioning and data management tool, as it comes with Partition Logic which competes with the likes of Partition Magic or Ghost.