
Alleyoop Memory Checker
Find memory-management problems in your programs using the valgrind tool
Apitrace Retracer
Play back and inspect traces generated by apitrace

Boa Constructor
RAD Tool for Python and WxWindows

Bustle
Draw sequence diagrams of D-Bus activity

D-Feet
Debug D-Bus applications

KDbg
Debug programs
gsharp
Write C# in an interactive shell, and inject your code into running Mono processes
Nemiver
Debug Applications

SPE (Stani's Python Editor)
Integrated Python Development Environment
Winpdb
Advanced python debugger

Cppcheck
A tool for static C/C++ code analysis

Alleyoop
Find memory-management problems in your programs using the valgrind tool

Eclipse C/C++ Debugger
Eclipse Stand-alone C/C++ Debugger

Eclipse C/C++ Debugger
Eclipse Stand-alone C/C++ Debugger

edb
edb debugger
OpenMSX Debugger
Debugger for the OpenMSX Emulator
Valkyrie
Graphical User Interface for Valgrind Suite

Dalvik Debug Monitor Server
Debugger for Android applications

Qt5 QDbusViewer
Debug D-Bus applications

Qt4 QDbusViewer
Debug D-Bus applications

Red Hat Eclipse C/C++ Debugger
Eclipse Stand-alone C/C++ Debugger

DTS Eclipse C/C++ Debugger
Eclipse Stand-alone C/C++ Debugger

Qt QDbusViewer
Debug D-Bus applications

Alt-Ergo
Automated theorem prover
Insight
GDB Debugger GUI

Red Hat Eclipse 4.6 C/C++ Debugger
Eclipse Stand-alone C/C++ Debugger

findbugs
Bug Pattern Detector for Java
D-Feet D-Bus Debugger
Debug D-Bus applications
LogFactor5
Graphical user interface for managing log4j log messages

Qt 5 D-Bus Viewer
Introspect D-Bus objects and messages

React Native Debugger
The standalone app for React Native Debugger, with React DevTools / Redux DevTools