Fusil (http://fusil.hachoir.org) has been accepted into Debian.

The description:

Fusil is a fuzzing framework designed to expose bugs in software by
changing random bits of its input.
It helps to start process with a prepared environment (limit memory,
environment variables, redirect stdout, etc.), start network client or
server, and create mangled files. Fusil has many probes to detect
program crash: watch process exit code, watch process stdout and syslog
for text patterns (eg. "segmentation fault"), watch session duration,
watch cpu usage (process and system load), etc.
Fusil is based on a modular architecture. It computes a session score
used to guess fuzzing parameters like number of injected errors to
input files.