There are many other alternative to WebSpeed, some of theme are available under various public license others may be implemented by different organizations and therefore are proprietary and unavailable to the open-source community.

I like to present here some of the implementation which I'm aware of, if you have something similar open-source or not you can send me an email in order to enlarge this list.

Please note that all these statement are my personal opinion, which is subjective by definition. I'll accept any comment on this matter and most off all I'll be glad to replace my comments with the original author review, so please be so kind and send me a short review that will best describe your implementation, or any comments that you found to my review.