Niche Operating Systems

Eugenia writes: "So, you think that BeOS or AtheOS are niche Operating Systems? Well, you haven't seen anything yet. OSNews provides a list and short description of the most active and most promising Operating Systems written by individuals or small teams just for the fun of it or because they have a dream of how the perfect OS should be (is there such a thing though?). Some of them, like SkyOS for example, are even quite far down the line in terms of usability and advancements."