debugging - Memory leak detectors for C?

Question

What memory leak detectors have people had a good experience with?

Here is a summary of the answers so far:

Valgrind - Instrumentation framework for building dynamic analysis tools.

Electric Fence - A tool that works with GDB

Splint - Annotation-Assisted Lightweight Static Checking

Glow Code - This is a complete real-time performance and memory profiler for Windows and .NET programmers who develop applications with C++, C#, or any .NET Framework

Also see this stackoverflow post.

Answer 1

second the valgrind... and I'll add electric fence.