I know some people people recommend GitLab or Assembla, though they are .com (which is not necessarily a showstopper, but...)    I liked the idea of Savannah, but I can imagine situations where it might be constricting (i.e. if a proof-of-concept/prototype utility uses some proprietary library.)  I was in discussion with Apache to make Schematron an Apache project at one stage, and had the necessary sponsor, but Apache seemed to be aimed at more elaborate projects.