The tutorial is from 2010. At the time people were much more enthusiastic about Haiku and other alternative operating systems.

Now we only have Windows and Unix like.

I still wonder what would have happened had Jean-Louis Gassée been less greedy and Apple acquired BeOs instead of Next.

I discovered BeOs in 2000 and it seemed to me much more interesting at that moment than either Windows or Linux. Not only it looked and felt better but it introduced other ideas and concepts.

I had hopes it's adoption will increase but it soon withered and died.

I still wonder why we can't do better than Unix and Windows. Unix is 50 years old and Windows is old, too. There should be better concepts out there waiting to be discovered and implemented.

At some point there were many companies, universities, groups and individuals involved in researching and implementing operating systems.

At that point I was following OsNews website daily and each day there were news about some new and exciting developments.

Not anymore.

I miss the days when I read about BeOS, Syllable, AROS, MorphOS, AtheOS, SkyOS, Plan 9, Inferno, Singularity. And there were a ton of interesting kernels, too.