There are countless arguments for using open source applications, but one of the strongest is the benefit of learning how to just one app and using it across Windows, Mac or Linux systems. Web site directory Open Source Living helps you find just the programs you're looking for and points you to where you can get them for free. It's not an extensive, all-in-one directory, but it seems to narrow its choices based on quality and widespread acceptance. And while not every application listed at Open Source Living is entirely cross-platform, a good deal of them are. For more free or open source applications, check out a Windows and Mac free software bonanza.