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The TUX web server is an unmaintained in-kernel web server for Linux licensed under the GNU General Public License. It was maintained by Ingo Molnár.
It was limited to serving static web pages and coordinating between kernelspace modules, userspace modules, and regular userspace web server daemons that provide dynamic content. Regular userspace web servers do not need to be altered in any way for TUX to coordinate with them. However, userspace code has to use a new interface based on the tux system call.
The main differences between TUX and other webservers include:
While only being able to serve static web pages could be seen as a significant disadvantage, TUX has one significant advantage: it is able to serve pages faster than traditional web servers. This is largely due to its place directly within the kernel, where it can improve performance by taking advantage of facilities not available to traditional web servers, which run outside of the kernel. However, this also means that TUX does not generate dynamic content. Because it is running within the kernel, such dynamic content cannot take advantage of functions that the kernel provides to userspace programs, and would create tremendous security issues.