Free MySQL Load Balancing PHPscript.
For load balanced access to your MySQL servers when you are using MySQL replication between one (or many) master and many slaves.
This script does reads on slaves and writes on master(s). It automatically checks if the challenger slave is "fresh enough" to read on it.
The script is actually used in real conditions, prove of the capabilities.
Imbalance is a lightweight redirector that runs as an Apache PHPScript, and a PHP daemon. Imbalance uses a cost based round-robin weighted algorithm to distribute load across web servers with the ability to create user defined cost calculations