linux syscall tracer
Source-to-source debuggable derivatives in pure Python
memory scanner for Linux
Linux source-level kernel debugger
grieferCode
Find memory issues & leaks in your iOS app without instruments
A new, open source, extensible, platform-agnostic tool
OllyDbg plugin: advanced labels
Allows executing code on MIPS32 EmbeddedLinux devices (WLAN routers)
An interpreter for the Lua language, written entirely in C#
C / C++ everything-memory debugger
Web debugging proxy based on Chrome DevTools network panel
A free IDE for C#, VB.NET, & Boo projects on Microsoft's .NET platform
Troubleshoot stack overruns