Xpress is a version of Sitecore’s CMS that has been seriously scaled back, but is ideal for developers wanting a no cost version and are OK with the restrictions. While the enterprise scalability and performance power has been pulled out, as well as the business user/marketing capabilities, the developer flexibility remains. If you are developer (who isn’t already a customer, commercial prospect or Partner) looking for a way to increase your Sitecore experience by spending lots of hours building cool personal projects, Xpress is the way to go.
If you aren't interested in Sitecore for business purposes, but are interested in personal development, then download here to make this happen.