You can browse the source tree directly via http://acegisecurity.svn.sourceforge.net/viewvc/acegisecurity/
If you want to get a copy of the source code to experiment with the latest changes or to build the sample applications, it can be checked out anonymously using the subversion command-line client:
svn co http://acegisecurity.svn.sourceforge.net/svnroot/acegisecurity/spring-security/branches/1.0.x-branch/
This will pull down a copy of the latest development source for the 1.0 branch of the project, which should be pretty stable and suitable for new users. For the latest new features, you can check out the cutting-edge trunk source, using the command:
svn co http://acegisecurity.svn.sourceforge.net/svnroot/acegisecurity/spring-security/trunk/
If you'd prefer not to use subversion directly, please see our downloads page for nightly snapshots. Note that these are from the project trunk and may not be suitable for new users