Fortuitous Technologies
- An Austin, Texas-based Linux consulting/IT company specializing in strategic planning and design, IT administration, training, and documentation, and customized vendor-neutral consulting.
Free Electrons - Free Embedded Linux Training
- Training materials on embedded Linux kernel & driver development, new features in the 2.6 kernel, real-time embedded Linux systems, development tools, Java in embedded Linux systems, and introduction to uClinux. Available in many languages.
IBM developerWorks : Open source : Technical Library
- Meta site. Free online tutorials, articles and other resources on a wide variety of open source topics, including LPI (Linux Professional Institute) exam prep (101 and 102), Linux sockets, XML, User-Mode Linux. Free registration required.
LPI Certification Self-Study Guide
- For the Linux Professional Institute's exams 101 and 102; available in HTML and PDF formats; German language version available in PDF format.
Linux Professional Group
- A non-profit group that develops training and certification materials.
Linux Professional Institute
- Professional certification for the Linux community; site available in many languages.
Linux.CertifiedProgrammer.com
- A help site for people studying for Linux certification exams. Includes information on certification programs, mock exams, and suggested books & videos.