no, extra_tests, nt-tools, ulpc, and ulpc.old (although ulpc could be considered a branch)
I don't exactly remember the ancestry for each of these right now, but at least nt-tools comes from inside the devline of Pike itself. There was a split like this (IIRC)
Pike/7.0 (with NT subdir) / Pike/0.7 (with NT subdir) - Pike/7.1 (without NT subdir) \ Pike/nt-tools
What makes 7.0 a branch and nt-tools a non-branch?