There is no single collection of software for the Beagle Board and the board is not shipped with any operating system or application software. Instead, the Beagle Board runs many operating systems and applications coming from the community.
To find out about software for Beagle, search the project listings. The test software for the Beagle Board is available on code.google.com. Some software is also hosted on www.beagleboard.org, but be sure to check with project page to determine if you are pulling from the proper source.