Allows debug programs written in C, C++, and other languages, by executing them in a controlled fashion, and printing their data, on a wide variety of UNIX and non-UNIX systems. http://sources.redhat.com/gdb/
Developer of Totalview, a tool which aids in the development of multithreaded, multiprocess and network-distributed applications. http://www.etnus.com/
A graphical X Window front-end for command-line debuggers such as GDB, DBX, WDB, Ladebug, JDB, XDB, the Perl debugger, or the Python debugger. http://www.gnu.org/software/ddd/
A logging tool for debugging and monitoring .NET, Java and Delphi applications. [Commercial, free personal edition for non-commercial use] http://www.gurock.com/products/smartinspect/
A tool that allows an individual or team to trace and debug any number of code units which may reside on multiple shared and dedicated servers at the same time. Supports ASP,VB,VC,VJ,T-SQL,Delphi,CFML. http://www.RemoteDebugger.com/index.html
A tool for analysing core files from crasched applications compiled by GCC. Runs on x86, PowerPC and Etrax (cris) Linux and compatiable systems. [Open source, GPL] http://www.arbetsmyra.dyndns.org/coretrace/