Rijndael Project is a personal research/lab project by Tomás Aparicio.
It's based on the development and maintenance of an x64 scalable computer server using software virtualization technologies.
This project was born on May 2008 and it's still running powered by free-open source software and open technologies.
Rijndael Project server provides a lot of services and other computing research projects.
If you got here you're probably looking for the AES encryption algorithm (codenamed Rijndael), in fact this project was named after it, but it doesn't really have much to do with encryption algorithms stuff.
If you'd like to, you can read about it here.