Robotics visualization and debugging
Lightweight static analysis for many languages
A multi-language debugging system for Vim
Snitch injects inline defs in your functions and multimethods
A real browser preview inside your editor that you can debug
A simple Bash IDE / Debugger
Simple solution for testing and documenting short code snippets.
HL7 Inspector is a tool for managing HL7 messages
HTML/CSS/JS and Markdown Playground For Web Designers and Developers
memory scanner for Linux
A low-power ISA design and simulator for a 2010 IEEE competition
Python script coding editor that debugs as you write
Use PHP Maintenance Editor to repair your code directly on the server.