If you are (like me) developing Ruby on Rails applications under Mac OS X, you are probably already familiar with Pow. Pow is doubtless the easiest way to run multiple Rack applications on your development machine.
The only thing not that intuitive to me was the whole linking progress as it was easy to lose track of what you already “deployed” to your local Pow installation.
Not anymore, Anvil to the rescue!
It adds a little menubar icon that gives you access to your Pow apps, allows adding new ones and lets you easily execute various Pow commands (start, stop, …). Finally a nice GUI for Pow! :)