GDB, the GNU Project debugger, allows you to see what is going on `inside' another program while it executes -- or what another program was doing at the moment it crashed.
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GDB is the #4 ranked solution in top Debugging solutions. PeerSpot users give GDB an average rating of 8.0 out of 10. GDB is most commonly compared to GNU DDD:
GDB vs GNU DDD.
As of August 2025, the mindshare of GDB in the Debugging category
stands at 11.9%, down from 13.4% compared to the previous year, according to calculations based on PeerSpot user engagement data.