Basically it’s no wonder that Chromium is on the list, Google’s Chrome is based on the same code and every upstream is for their benefit. Mozilla is one of Google’s big partners and paid to have Google as the standard search engine in their popular browser Firefox. Some would even say, that the Mozilla foundation is practically depending on Google financially. Another project that fits the category is Google caja, which works as a framework for secure internet applications.
Another project I literally stumbled upon is Haiku. Haiku aims to be a BeOS like operating system in looks and unity of user interface and software. The goal is to keep simplicity as far as possible. Seven students are in for this years summer of code on this alternative operating system.
If you ask yourself what else Google is and does, I’d recommend you visit the blog of a dear friend of mine, which offers a little more suspicious view on worlds most used search engine: blog.thinking-aloud.eu.