Current Free #github alternatives (software, not hosting):

pagure.io/pagure
gogs.io / gitea.io
kallithea-scm.org
gitlab.com/gitlab-org/gitlab-ce
rocketgit.com
phabricator.com

Less full-featured:

ikiwiki-hosting.branchable.com
git.zx2c4.com/cgit
git-scm.com/docs/gitweb
gitolite.com

Very idiomatic, but it is git hosting, and it has changes-as-issues:

gerritcodereview.com

Also posted at https://quitter.se/notice/9473091

Which ones did I miss?