I'm sure you know VPL on Wikipedia , which lists many different VPL languages. You did not provide information about what you are trying to achieve, but a different Summary site . This is a commercial product.
On its website:
Synopsis is a fully visual RAD tool for Windows that frees you from writing text code and learning unnecessary programming details. With Synopsis, you can focus on building software instead of tackling the mundane and low-level development challenges.
The following shows what this app looks like:
alt text http://www.codemorphis.com/images/visual_programming_example.jpg
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