Hobo is an Open Source extension to Ruby on Rails which helps you build full blown web applications incredibly quickly and easily. Available as a Gem or Rails plugin, Hobo provides a simple, clean and elegant development framework which allows for rapid prototyping or production of the most sophisticated web applications.
Long Time Lost is a free "service" that allows you to create a "search" for someone you lost touch with. That "search" is then indexed by Google (and other search engines) and then when that person you are looking for (or someone who knows them) does a "Vanity Search" they find your "search" and can respond to you and reconnect. A "Vanity Search" is the process of searching for one's own name on Google... we know you do it! All information is handled through the system so your private information like your email address isn't out there on the net. It's Web 2.0, it's powered by Google, it's Ruby on Rails and best of all; it's free.
Cloud Foundry, a VMware-led project is the world's first open Platform as a Service (PaaS) offering. Cloud Foundry provides a platform for building, deploying, and running cloud apps using Spring for Java developers, Rails and Sinatra for Ruby developers, Node.js and other JVM frameworks including Grails.