GDB front ends and other tools
1. GDB Front Ends
Here's a partial list of front ends using GDB. If you know of others, please add a link.
Using modern GDB/MI:
GNU Emacs (24 and beyond)
Using the old (deprecated) annotations mechanism (please fix them!):
2. Other tools that extend GDB
PGDB - PGDB is a parallel/distributed debugger, based upon GDB, designed for debugging MPI jobs on a cluster.