Languages and Compilers - Rigal
   Introduction to programming language Rigal. Offers links to other programming language and compilers.
   http://www.sai.msu.su/sal/F/1/RIGAL.html

RIGAL
   Official site with language description and Manual Page in HTML format as well as published papers about Rigal.
   http://www.ida.liu.se/~vaden/rigal/