innotop
innotop is a 'top' clone for MySQL with many features and flexibility.
- completely customizable; it even has a plugin interface
- monitors many servers at once and can aggregate across them
The manual is embedded into the program in Perl's POD format, so it should be available through perldoc and man, and is still available online on the previous hosting (the project moved from google code to git): http://innotop.googlecode.com/svn/html/index.html
The full history has been imported in github.