Athene: A Multi-Platform OS
Athene is an object based operating system that is being developed for use in PC's and embedded systems. It has been designed to work in almost any software and hardware environment and can be reconfigured to suit the requirements of the target system, as well as individual users. The user interface is completely rewriteable and is capable of emulating other interfaces such as the Microsoft Windows and Amiga desktop environments.

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AtheOS is a free desktop operating system under the GPL license. AtheOS currently run on Intel, AMD and other compatible processors and support the Intel Multi Processor architecture. I have seen quite a few anouncements of "promising" OSes with "great potential" during the development of AtheOS. The problem is that when I follow the links I normally find a description of the concept, a floppy-bootloader written in assembly, and not much else. AtheOS is a bit more mature, and is already running quite a lot of software.

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BeOS
This is a mirror of BeOS R5 Personal Edition for Windows. It comes in a self-installing executable, making installation easy and painless. If you're running Windows Millenium Edition, Windows NT, Windows 2000, or Windows XP, you will need to create a boot disk with the included utilities. Otherwise, you can simply double-click the icon installed on your desktop to launch the Be Operating System. BeOS Personal Edition can have problems booting when it is installed to an NTFS partition. If at all possible, install it to a FAT partition.
This does not in any way alter or harm your Windows installation. BeOS Personal Edition is entirely self-contained within a file installed onto your Windows partition. If you would like to put it in its own partition, however, you may do that from within BeOS.

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BigSlack
New with Slackware 7.0 is BigSlack - another special edition of Slackware Linux. BigSlack is similar to ZipSlack in that it is designed to be installed to a FAT filesystem, without the need to repartition your drive to get the benefits of running Slackware Linux.
The main difference in BigSlack and ZipSlack is what's included. BigSlack includes the majority of a full Slackware install - including a preconfigured X Windows setup and GNOME. As such, it takes much more space than ZipSlack, requiring about 850 megs of free space.
BigSlack is ideal for people who have the hard drive space to spare, are looking to try out a full Slackware Linux installation, but do not want to repartition their hard drive.

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Boot ChoOSer
If you have multiple versions of Windows (2000, NT, or 9x) installed for dual-boot and switch between them regularly, you'll find Boot ChoOSer a must-have. It sits on your taskbar notification area, next to the clock (although it also works with versions of Windows NT lacking a taskbar) and allows you to switch between all installed operating systems with a right click.

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Core is designed and constructed around one simple philosophy: to be the absolute minimum of what is required for a Linux operating system. Core is designed to be the basis for a larger, more complete operating system constructed by the end user. It contains only what is necessary to boot into Linux and download, compile and install other software packages.

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