The final release of PalmOS, 6.1 Cobalt: colour, multimedia, and multitasking
palmsource.com
palmsource.com
[1] https://www.palminfocenter.com/news/7874/palm-os-cobalt-phon...
[2] https://www.reddit.com/r/Palm/comments/cjx9d9/palmos_61_coba...
https://www.osnews.com/story/6148/interview-palmsources-geor...
Palm acquired the remains of Be, Inc. in 2001. The company made BeOS, a single-user desktop OS that caused a lot of waves in hacker circles in the late 1990s, but never found its niche or killer app.
After the acquisition, the Be engineers went to work creating a next-generation Palm OS that would retain most of the familar UI but was completely rewritten under the hood. Essentially like Windows 3.x -> Windows NT, but for PDAs and smartphones.
If the stars had aligned, maybe it could have been a contender against iOS and Android! I was always rooting for BeOS...
[1] https://www.palminfocenter.com/news/7874/palm-os-cobalt-phon...
[2]https://www.reddit.com/r/Palm/comments/cjx9d9/palmos_61_coba...
At least that is the way I've seen the term used when it comes to development hardware.