Download a PDF, print it out, instant graph paper.
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.
A free, online book on the C programming language. There is also a downloadable .pdf file of the contents of the e-book so you don't have to try to archive the whole website.
An open source, cross-platform e-book organization application. Also handles format conversion, conversion of RSS feeds into e-books, reader synchronization. You can even read your e-books with it.
An interesting bit of historical text originally published by Oak Ridge National Labs on the topic of surviving a nuclear war.
A utility for analyzing .pdf documents to extract older changes to the text and view previous editions (good for un-redaction?) as well as scrubbing the document history so that no one else can do the same thing to your docs.
User manuals. 1.4 million of them and counting. Free for the downloading.
A large and diverse collection of documents in .pdf format, courtesy of textfiles.com.
A Creative Commons-licensed book by Al Sweigart that teaches programming in Python through writing your own video games. Full source code is included.
F/OSS software written in Java to split, merge, extract pages or images, and alter the contents of .PDF files in other ways. Works pretty well on Linux, haven't tried Windows yet.
A CC-licensed cheatsheet for building with and programming the Arduino.
Anders Sandberg's Eclipse Phase resources.
An application written in Java that takes a PDF and rearranges the individual pages into signatures, suitable for traditional bookbinding.
Someone made up stickers that you can download, print, and put on all of your laptops over the hard drives in case you ever feel the need to run a power drill through them.
Cryptome's page of TEMPEST documents, most of which are declassified NSA docs though there are also mirrors of TEMPEST info from the private sector. Also has a very interesting discussion of how STU-III phones can be accidentally compromised by stray RF. Oops.
A website which allows you to upload arbitrary images or document files to be run through optical character recognition software. Text is output to the bottom of the screen, suitable for cut-and-pasting. Uses the Cuneiform and Tesseract OCR packages on the back end (but not both at once).
An archive of movie shooting scripts (mostly science fiction), which will be of interest to fans and aspiring scriptwriters.
3749 links, including 199 private