Theme Juice is a desktop application built on top of tj, a command line utility I have been developing for the past 3 years that aims to make WordPress development much more enjoyable and as close to a Rails workflow as possible. http://cli.themejuice.it/
It leverages huge open source projects like Vagrant for local environments, Chef for provisioning our virtual machine, Capistrano for deployment, WP-CLI and more.
Currently our beta pool is relatively small, so I wanted to post here and see if anybody was interested in becoming a beta tester if we end up needing additional users. If you're interested, please register at https://www.themejuice.it/register and I will send out additional invites as we need them!
I would appreciate any feedback you have and would love to know if you've used (or even heard of) tj before!