Implementation of Algol 68 as defined by the Revised Report

 Algol 68 is a secure, expression-oriented programming language with which
 you elegantly code algorithms without having to bother too much about
 irrelevant technical details and limitations inherent to many other
 languages.
 .
 Algol 68 Genie offers for example:
 » many runtime checks facilitating debugging and improving the
 » reliability of your programs, native support for arbitrary precision
 » arithmetic including complex numbers, syntactic constructions to
 » support linear algebra, a gdb-style debugger and a pretty-printer to
 » beautify source code, optional linkage to GNU plotutils, the GNU
 » scientific library or PostgreSQL, extensions as UNIX pipes, regular
 » expression matching, and web page content fetching.