gmuck assists you in generating valid (X)HTML by examining the source code that generates it. It is not a replacement for real validation tools, but is handy in quick checks and in situations where validation of the actual markup is troublesome.
phpmode is a mode for jed that helps in editing PHP files. It does keyword highlighting and proper indenting, plus a slew of other functionality.
pprint - cross referencing postscript pretty-printer for C/C++/Verilog source code
ARSperl is an integration kit for Perl5 and Remedy ARSystem API. It provides a large subset of the functionality found in the ARS C API https://github.com/jeffmurphy/ARSperl