Because the Linux kernel and all its attendant utilities are open source, you can combine the software any way you'd like. Indeed, many Linux distributions, Live CDs, and virtual appliances are available, each with its own bent or specialty.

Ideally, building a custom Linux distribution would be as simple as burning a CD. In practice, though, the process is more complex, typically requiring the expertise of a developer or system administrator.

Slax is a notable exception. Akin to shopping online, you can assemble and generate a custom Linux distribution with a few clicks of your mouse. Slax is so incredibly friendly and easy to maintain, you won't believe it.

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