Eclipse License IBM's using something they call the "Common Public License" for Eclipse. It seems more in the spirit of the X license than the GPL as it does not seem to transfer to derivative works, nor does it mandate access to source code. IANAL, so please feel free to set me straight. I'm surprised at how little interest there's been on IBM's licensing strategy, as it seems pretty critical to how they hope to grow their services business model. The only advantage to releasing this toolkit is to boost WebSphere development, but why not just offer it as a free SDK?
Thanks to SSchwartz for the pointer.