Never listen to somebody telling you to never do something!
Some 10 years ago, I picked up a simple USB keyboard from the scrap box of a hackerspace before to see whether it really was broken. It was missing one key, which made me think maybe that's all that's wrong with it. Turns out I can do without the Numlock key and all other keys work perfectly. When I have to press the Numlock key I use a pen. I never had to move another keycap onto it.
My idea when I took this keyboard was to same working tech from being dumped and destroyed and to have a random spare in case I needed a USB keyboard because I only had spare PS/2 and one very cheap and bad 2.4 GHz USB keyboard (if not 800 MHz). But there's something special about it. It's a BLANK keyboard, which seems to be a brand solely marketing keyboards without any markings or labeling on any key. I had heard of them before and thought it's an interesting idea. But I wouldn't have chosen to buy one. At some point I needed a USB keyboard and tried the blank one for a while. Since then I use this keyboard for my desktop PC intentionally, not because I don't have another one. I thought I'd write down my experience in getting used to it and what it did to my typing.
It appears a bit surprising to me now but at my first experience with the Blank keyboard was what I expected at the time. I was using it on a opened laptop with a broken keyboard. And I was very glad to have a labeled reference in front of me. typing a word or two took ten or twenty times as long because I didn't know what any of the keys were. Well, some are obvious (Return, Escape, Space, etc.). I must have cought a particularly patient time in my life. Because I kept trying to hit the right keys when typing. I also didn't really type texts on that machine at that time. So it wasn't too much of a dive into label-less typing. There must have been enough moments where I hit the right key first try to motivate me to keep trying and maybe learn to type blindly. When the laptop keyboard had dried sufficiently I was very glad about being able to switch back again. Such a relief. But I chose to go back to the blank one for a while every now and then. There were so many times where I started to type one or half a key to the left or to the right, so I started to produce gibberish, deleted the last few characters, adjusted my hand's alignment a few millimeters and try again. Sometimes (actually still pretty often) it took five or more attempts to hit the right keys. That was how I typed for a long time. When I wanted to type "Foo Bar Baz" I typed something like "Gpp<< I'll leave it at that one example. But it was a long
HelenOS
One of those operating systems that is used for operating system research here and there. I think that's also what it was made for. The last releast was earlier this year, which makes it seem one of the more actively developed research OSs. With the release there are also prebuilt ISO for a variety of platforms including the usual, Raspberry Pi, other ARM platforms and older PCs.
There are similarities to UNIX-like systems but it is clearly not a POSIX system. Basic utilities are included as well as some basic console and graphical applications and demos. I didn't look for any additional software, yet. I'm not sure if I will use this os much more. But by booting flawlessly without any changes and effort, this is one of the more usable OSs I've tried. So I might. It has network capabilities, a basic GUI and TUI, window manager and its own shell.
The GUI is optional. Most applications run in the console mode as well, which is a TUI that mimics the GUI with its start menu. Which is good to have because the GUI is really slow to the point that the mouse pointer is lagging behind.
On my desktop PC neither a PS/2 nor a USB mouse worked. But the touchpad in my old latitude worked fine, including the second set of mouse buttons that work in almost no OS. Graphics mode worked with the appropriate resolutions automatically. Above that I haven't tested any hardware.
There are screenshots in the official wiki.
Haiku OS
Haiku OS is a BeOS clone. I didn't use BeOS back in the day (although I wish somebody would have showed it to me). So I'm not sure, but Haiku seems to be pretty much the same experience. But Haiku is open source, still actively developed and compatible with newer hardware. It ran relatively well on the Core2Duo PC I've tested it on. Except for the included web browser. That thing crashed. For a lot of people whether a desktop OS is usable is decided on how good of a web browser is available for it. Haiku OS Beta 3 looked promising with its WebPositive using WebKit 612.1.21. But at least on the old PC I've tested it on it wasn't usable. It was slower than imaginable and kept crashing after one or two page loads. (The simple included help pages at that. I didn't even feed it something complex, like YouTube or Google Docs.) But I've heard others hat a pretty good web experience with it. At least as long as nobody asks about security. The rest of the system is snappy enough. It's no KolibriOS, but on any x86 or x86_64 from the last ten years it should be as fast as anyone wishes their OS to be and much older computers run it just fine. There seems to be a not so small community of users and developers. Every new Beta that is released comes closer to a desktop OS that has everything that people ask about/for. (Let's not talk about big games people are familiar with.) And because of the growing community and the fact that the 32 bit version can still run many applications compiled for the original BeOS this is not just a small OS with theoretical goals bigger than its community. It's really usable already and it looks to me that it has good chances of becoming more important in the future. I'm not sure if I'd have said that five years ago. It's moving slowly (compared to Windows and Linux), but consistently towards its goals.
Edit 2024: The have been two new alpha releases since I wrote about Haiku here. It is definitely capable of being an everyday desktop OS even though the release candidate's version labels are modest. The biggest change recently has been that GTK has been ported to Haiku, meaning that a large number of graphical applications becomes available or portable. Applications that have been written with other operating systems in mind. This has been demonstrated with Inkskape and GIMP. But many more applications will follow, I'm sure. I suspect that this also means that Firefox or some fork of it will be the web browser most people will use on Haiku. It certainly makes it more usable as ther main OS for many people.
Essence
This is one I'm continuasly disappointed to not have been able yet to get running on real hardware. I like what I've seen. But I can't get it to boot, as do others. I don't know too much about the internals of Essence. But it seems to be relatively far in develpment. There is a sleek GUI with tabbing windows in the look of early Chromoium browsers, which looks very inviting, if only I could get it to even try to boot on any computer. The focus has not been on making the OS actually boot on real hardware so far. And unfortunately there has been no release since 2022 and no update to the code for over a year. So I stopped hoping that it might be working soon. I was looking forward to getting to know a knew OS that doesn't take a Unix-like approach and has nice tabbing windows.