Mirrors
I mirror some content I regulary use or for other reasons decided for which I felt like needing a local copy.
Mirrors can be found in here.
The Art of Unix Programming
The Art of Unix Programming was written by Eric Steven Raymond and explains the Unix philosophy, tradition and history. I have previouly used it as a reference to not only make my programs "more Unix" but also as a general guide for software architecture and design in its entirity.
I mirrored it from its original webpage catb.org.