Haiku OS (a modern clone of BeOS) finally entered Beta stage after many years of development.

I installed it on both my main PC and my laptop and I'm pleased to say it works very well. Its a bit buggy, but apart from that it seems reliable enough, and is very pleasant to use.

As with any uncommon OS, it has a bit of a shortage of software, but it does at least have a reasonably up to date web browser.

Its well worth a try if you haven't used it before.