One of the presenters at the aforementioned Rebol  Talks was a Brian Otto who showed his UI Builder. It's quite cool. https://youtu.be/mjVtXfdTZIQ (direct link). If you're into WASM, check it out. Brian Dickens did a great editing job on these videos, by the way. Very watchable.
Not sure how many here know about NLPP, which is a Non-Linear Performance Pricing tool written in REBOL. We just got a new partner. You may have heard of them: