• Rango is most important project I designed. It is Rack-based lightweight framework inspired by Django and Merb. It's the first and the only framework in Ruby implementing template inheritance. RubyInside.com wrote an article about Rango. Recently I extracted template-inheritance to a standalone library.
• Pupu is my solution for managing assets, so it's easy to install, update or uninstall packages with JavaScript frameworks, icon sets etc. I have already packed Blueprint CSS, MooTools, autocompleter, lightbox and others.
• Minitest.js is my testing framework for Node.js. It's build with testing asynchronous code in mind.
• Formidable is a form builder. Forms include often very complex logic which I believe should not be part of views.
• My other interesting projects are Ace, generator of static HTML sites, Nake, flexible Rake replacement and Git Deploy, deployment solution based on Git hooks. See my GitHub profile for more.