Puppy Linux for Old PCs
It is much better to rescue an old computer and make it useful than to simply toss it out into the garbage. Linux makes this easy - er, well, kind of easy, depending on the distribution and your tolerance for troubleshooting. While more and more Linux versions are requiring more and more computing power, thankfully, not all of them suffer from the never ending quest for software progress.
Puppy Linux is one of the lean, mean Linux distributions specifically designed to work well on older as well as newer hardware. There’s an extremely small version without a lot of added software, and a more “bloated” version that includes Seamonkey browser and email suite.