http://sv.gnu.org/ points to http://savannah.gnu.org/

http://sv.nongnu.org/ points to http://savannah.nongnu.org/

http://savannah.gnu.org/p/ and http://savannah.gnu.org/pr/savannah point to http://savannah.gnu.org/projects/savannah

http://savannah.gnu.org/u/rms and http://savannah.gnu.org/us/rms point to http://savannah.gnu.org/users/rms

Requests like https://savannah.gnu.org/tracker/?func=additem&group=unix_group_name&prefill[summary]=sum&prefill[details]=text direct to a form for submitting a new item in tracker of unix_group_name with pre-filled summary like sum and submission text like text, where tracker is (bugs|task|patch|support). Other fields like category or priority could be pre-filled likewise.