Delve is a debugger for the Go programming language
A toolkit to make debugging iOS applications easier
Debug bar for PHP
Debug Facility for Real-Time issues
Debug bridge for Android applications
Debugging tool for bug hunting and performance tuning on smartphones
grieferCode
c/c++ debug-mutex library
A GUI to Perl & Python script debugger
GPL task manager replacement for Windows
A java-based interceptor for SSL/TLS protocol
A debugger similar to MS-DOS' "debug.com" (32-bit x86 only)