This site brings together all the free, open-source projects Google has created over the years. You can discover what they do, learn how Google uses them and grab the source code for yourself (assuming you’re a dab hand at software development). As you’d expect from Google, searching for the projects is quick and easy – there are two list views and a drop-down search menu packed with categories. You’ll also find lots of documents, information about hosting an open-source event and details of student programs and contests. Be sure to check out the blog, too.