I just had a chat with BMC Software's William Hurley (aka whurley, a long time open-source advocate) about the latest moves by Microsoft, Adobe and Sun into open-source development. In the last two weeks, we've seen all three companies release code for their developers kits under open-source licenses: Adobe's Flex SDK under the GPL, Microsoft's Ajax toolkit and dynamic runtimes for .NET under the Ms-PL (a shared-source license) and Sun's new JavaFX Script, which the company plans to release under the GPL later this year.