Indeed; what happened to systems like DR DOS, BeOS, and AmigaOS is a disgrace. DR DOS is still "supported" in the sense that you can pay for a copy from the ostensible rights holder, but the company doesn't appear to provide any actual development or support services, and it looks like they haven't issued a press release since 2004. DR DOS source is also out there, but only licensed for noncommercial use.
As far as I can tell, it's owned by DR DOS Inc. which also had a d/b/a "DeviceLogics" that now seems to be defunct (inasmuch as devicelogics.com now redirects to drdos.com). However, the status isn't exactly obvious to me.
The only source release I know of that is still readily downloadable is at drdos.net, which is version 7.01.
