The FreeNOS code is publically available on our Subversion repository. To check out the lastest code read-only, point your SVN client to http://freenos.googlecode.com/svn/trunk:

$ svn checkout http://freenos.googlecode.com/svn/trunk/ FreeNOS

Developers who need write access may use the https variant at Google Code:

$ svn checkout https://freenos.googlecode.com/svn/trunk/ FreeNOS --username USERNAME