Blinksale: Do your Rails invoices in a Rails app.
Now that you’ve made it out of the ghetto and joined the hundreds of professional Rails programmers making a living enjoying your work life, you’ll need an invoice system to match. Blinksale
might just be what you need. It’s a snazzy Ruby on Rails application by
Firewheel Design that follows the 37signals school of design with less
software and developed under strong inspiration from the Get Real
process. [Riding Rails]