Red Hat has taken over the project, so expect this to be very very active. The ELKS kernel image needs about 200K and a full running system should require 400K-512K. Linux is used as the development platform for ELKS at the moment. Site has not been updated in a while. Fiasco GPL x86 Quite an active development project. I couldn't see much happening here.
Site is out of date and nothing much seem to be happening on the development front.
The latest version of FreeBSD is 4.2 and it is under active development and support. The site is up to date. The latest release, FreeDOS Beta5, was released recently in August 2000. Not as bad as most of the other free operating systems that seem to have sunk into oblivion. Still does not have multitasking, protected mode.