Webload is not open source. Try asking for the source code to proxinator like I did. You will learn that it is dual licensed and that a good portion of it is distributed in object form (see http://www.webload.org/community-resources/index.php topic name "Source code for proxinator").
I find it interesting that Radview is fishing for 'customers' to its freeware product within the OpenSTA user base. They are currently advertising for an "OpenSTA to Webload" migration manager. Perhaps that person will be reporting to the "webload/free to webload/$ migration manager.
Anyway, I can confirm Corey's comment that, despite recent comments about OpenSTA's death, a new version is coming soon and some much needed enhancements beyond 1.4.4 are in the works all of this being funded by revenues from a new commercial support offering.
I fully agree with Bernie's characterization of WebLOAD *not* being "Open Source" (regardless of what they say it is). It contains proprietary components. It is rather disappointing to see a company jump on the bandwagon of open source without respecting the freedom that is supposed to come with it.