Chromium is an open-source version of the Chrome Browser by Google. While I recommend Firefox as the most reliable browser for privacy enthusiasts, Chromium is probably a reasonable alternative for everyday web browsing. Chromium does have the advantage of being a speedier than Firefox in certain areas. Here is a comparison chart and a technical discussion assessing the speed and privacy features of Chromium and Firefox. It seems that Chromium may make some behind-the-scenes calls to Google, but these can be blocked with a plugin or scripting.