So yeah this took an age for me to even get around to.
In short, it converts a standard Hex colour pallette to a close representation of what the APB HSL system is. It was coded by myself in an afternoon (after about half a year of being lazy and doing several re-writes). It does one way conversions at the moment (it only converts Hex to APB HSL, not the other way around), but will support discrete two-way conversions (more like approximations) soonTM.
Link is here and the changelist is do