Doctor JS

http://doctorjs.org/

http://doctorjs.org/try.html

"Doctor JS is a genius. ... He'll analyze your JavaScript code ..Just POST to http://doctorjs.org/analyze with the src field set to your source code, and the doctor will give you an analysis in JSON. "

The Regex Coach - interactive regular expressions

The Regex Coach is a graphical application for Windows which can be used to experiment with (Perl-compatible) regular expressions interactively. It has the following features:

http://weitz.de/regex-coach/

(For another ground up explanation  also see http://www.websina.com/bugzero/kb/regexp.html)

BESEN - Js/EMCA IDE

BESEN is an acronym for "Bero's EcmaScript Engine", and it is a complete ECMAScript Fifth Edition Implemention in Object Pascal, which is compilable with Delphi >=7 and FreePascal >= 2.5.1 (maybe also 2.4.1).

Its will compile under Lazarus on numerous Linux distributions, Mac, and on Windows under Lazarus or Delphi.

(BESEN is copyrighted free software by Benjamin Rosseaux <benjamin@rosseaux.com>.
You can redistribute it and/or modify it under either the terms of the AGPLv3
or the conditions below ...)

Also a command line shell for Js/EMCA - Linux 386, Linux AMD64, and Windows.

http://besen.sourceforge.net/

English        http://blog.rosseaux.net/en/posts/l0kce9#l0kce9

German        http://blog.rosseaux.net/posts/l0kce9#l0kce9

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