Rédigés par le célèbre Bruce Perens, voici une série de livres (en anglais) disponibles gratuitement au format PDF.

- Embedded Software Development with eCos ;

- Implementing CIFS: The Common Internet File System ;

- Intrusion Detection with SNORT: Advanced IDS Techniques Using SNORT, Apache, MySQL, PHP, and ACID ;

- Rapid Application Development with Mozilla ;

- Managing Linux Systems with Webmin: System Administration and Module Development ;

- The Linux Development Platform ;

- The Official Samba-3 HOWTO and Reference Guide.