I miss BeOS, TBH. I ran a heavily customized BeOS R5.05 install that had upgraded bits from OpenBeOS (later, HaikuOS), ZetaOS etc.
I ran it as a daily driver on a Dell GX1 SFF that I swear was designed for BeOS: Max RAM the BeOS kernel supported without hackery was 768MB - The GX maxed out at 768MB; The GX1 had a Rage GPU that BeOS natively supported (Including 3D Acceleration!) which was a very short list; the GX1 had a supported NIC, IDE controllers, etc etc.
I had upgraded the CPU to a 1.4GHz Tualatin-S that, sadly, had to run at 1.04GHz as the GX1 wouldn't run a FSB higher than 100mhz so my 133mhz FSB Tualatin had to bop down a little. Still screamed.
sigh I miss that system. I would still be running it if lightning hadn't fried it.
It sat next to my NeXTstation Turbo Color that I used for way longer than was reasonable as my primary system, lol. The NeXT was a daily driver till 2008.
33mhz 040 w/ 128MB 60NS EDO. OPENSTEP4.2 + lots of ported goodies friends and I did. Even managed to get SSLv3 working and load newer websites! :D
... wish I hadn't sold it.
Oh yeah! I also had a Pre-FCC certification dual 66mhz BeBox. Cool machine. Slow as shit though. The 603e in it wasn't natively SMP capable IIRC. The GLU chip could either run one CPU with L2 cache or dual CPUs with L2 cache disabled. Coherency was done in software. Unless I am horribly misremembering. It was a nasty hack and showed.
My BeBox! https://www.flickr.com/photos/helfer/albums/7215762193739249...
My GX-1 and my NeXT :D https://www.flickr.com/photos/helfer/6676203105/in/photolist...