Poper
Poper makes sure that your git commit messages are well-formed
Usage
Poper is partly inspired by an article written by tpope. That's where the name comes from actually. Rules from the article form the basis of Poper rules.
Install Poper like any other gem and then run it from your terminal, specifying a commit:
gem install poper
cd /repo/which/commits/you/want/to/check
poper run 86ae550
Every commit between current HEAD and specified commit will be checked.