Debugging

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.

The standard debugger for the GNU software system. Runs on many Unix-like systems, supports Ada, C, C++, FreeBASIC, Free Pascal and Fortran. Site includes release schedule, documentation, download option, news, bug reports and mailing lists.

One page web-site that offers a very basic mechanism to enter regular expressions and to test if provided input matches these. Result output is in the form of some sort of parse tree.