Apache-log-replay is a project mainly written in Python, it's free.
A simple script that "replay" requests based on apache's access logfile
Features
Requires Python >= 2.6
Simply download the file and execute it...
Usage: apache-log-replay.py [options] logfile
Options:
-h, --help show this help message and exit
-p PROXY, --proxy=PROXY
send requests to server PROXY
-s SPEEDUP, --speedup=SPEEDUP
make time run faster by factor SPEEDUP