You can obtain the approximately-latest version of the DomTool source code from HCoop Anonymous Git. To clone simply execute:
git clone git://git.hcoop.net/git/hcoop/domtool2.git
If you have been granted write permission to the repository and plan to commit code changes, then you'll want to check the repo out either via ssh or openafs using an account with credentials to write to the domtool git directory.
git clone ssh://USER@ssh.hcoop.net/afs/hcoop.net/user/h/hc/hcoop/.hcoop-git/domtool2.git git clone /afs/hcoop.net/user/h/hc/hcoop/.hcoop-git/domtool2.git