A couple tricks for stats
From Yade
Number of lines per author in current HEAD (from stackoverflow):
git ls-files -z | xargs -0n1 git blame -w | perl -n -e '/^.*?\((.*?)\s+[\d]{4}/; print $1,"\n"' | sort -f | uniq -c | sort -n
Number of commits per author (all times):
git shortlog -sne