Algol68g

Algol 68 Genie (a68g) is a recent checkout hybrid compiler-interpreter,
written from scratch by Marcel van der Veer. It ranks among the most
complete Algol 68 implementations. It implements for example arbitrary
precision arithmetic, complex numbers, parallel processing, partial
parametrisation and formatted transput, as well as support for curses,
regular expressions and sounds. It can be linked to GNU plotutils, the GNU
scientific library and PostgreSQL.