Well, the latest version of the free Scratch programming language (scratch.mit.edu) will let you run the WeDo motor and sensors. But only a single hub, as far as I know. That's how I'm running it, since I don't have the WeDo software.
Here's another plug for using WeDo with Scratch (scratch.mit.edu): Scratch has most of your basic programming control structures that you are used to in a nice syntax-free drag and drop environment. The distance sensor returns a value between 0-100 and you can set up branches on any value you like using If-then-else. Scratch is limited to a single hub, however, so that might be a show-stopper for you. But the software is free so you can pull it down and give it a try anyway. In the interests of full-disclosure I will tell you that I am an employee of the MIT Media Lab (developers of Scratch) so I'm quite biased :)
