A free, independent, and open source set of curricula for learning languages.
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David MacKay has put the textbook he wrote online for everyone to download in a variety of formats. If you find it useful, consider buying a copy.
Higher Intellect is a World Wide Web server hosting a searchable database of over 750,000 text files on a variety of subjects. We also host a server running on the Hotline and KDX protocols featuring a vast collection of antique software, obscure operating systems, and open source software. To connect, simply download a copy of Hotline/KDX and connect to kdx.preterhuman.net
A Creative Commons-licensed book by Al Sweigart that teaches programming in Python through writing your own video games. Full source code is included.
A grassroots peer-based education project based around online learning and remote collaboration between small groups of students. They just started up so things are a little thin at the moment. This is an interesting experiment to keep your eye on. Creative Commons.
A site that has presents a step-by-step howto for getting involved with OpenStreetmap.
A blog entry which catalogs free as in beer foreign language lessons, usually in the form of podcasts.