Perl

Perl has been my weapon of choice for over a decade but now I’ve switched completely to Python for current and new development.

Perl 5 is a highly capable, feature-rich programming language with over 26 years of development. Perl 5 runs on over 100 platforms from portables to mainframes and is suitable for both rapid prototyping and large scale development projects.

“Perl” is a family of languages, “Perl 6” is part of the family, but it is a separate language which has its own development team. Its existence has no significant impact on the continuing development of “Perl 5”.

— http://www.perl.org/about.html