The Internet Archive
The Internet Archive is an amazing resource and outstanding project which aims to digitize and archive anything and everything (seemingly) it can get its hands on. The Internet Archive has archived over 456 billion web pages, over 1.9 million moving images, over 7.8 million documents, over 2.3 million audio files, and over 96,000 software programs. This unfathomable amount of information is available to you for free 24/7.
Additional projects of the Internet Archive include efforts to digitize all written materials produced by entire countries and creating free mobile libraries (which print books on demand) to areas where the internet is not available.