Open Perl IDE is a visual, integrated development environment for writing and debugging Perl scripts with any standard Perl distribution under Windows 95/98/NT/2000.
lida is a fast feature packed interactive ELF disassembler / code-/cryptoanalyzer based on bastards libdisasm (see bastard project).
Performs basic checks on shell scripts for the presence of non portable syntax.
XPHP is an IDE authoring tool for Windows that allows you to design, develop, test, debug and deploy PHP applications. [This project has been discontinued since 2005]
This script helps you patch your favourite programs, to keep them from incrementing error counters or decrementing life values. It's in CPAN as Games::Hack::Live.
Grevis is a Linux graphical tool for learning and debugging the Perl regular expressions. It uses the output of the regular expression debugger (as of version 5.8.10) to obtain data needed to visualise the matching process step-by-step.
Function call tracing in the Linux kernel and userspace applications. Dynamically sets probes (using VProbes, a KProbes variant) and displays the function call trace of a process calling kernel or application functions. The superior of strace and ltrace.
spyGLass is an OpenGL call tracer and debugger. It goes a step further than simply using ltrace because it knows what the arguments to the various gl* calls are, and it also knows about OpenGL's error flag.