@chuckleplant ofx includes ofxGui. Its built on top of the ofParameter, and is very good for fast prototyping, that covers a wide range of use cases.
I used a lot ofxUI in the past, but is now deprecated by the author, and it has a lot of small bugs and nuisances that will not be corrected. Lately I have been playing with ofxDatGui, which seems promising for my style of projects, but has, as most UI's, a very specific approach that limits the expansion and variety of use cases.
In my experience, flexible and customisable UI's are very hard to develop and maintain, just take a look on how many different approaches are available in the HTML world. In my opinion, if you work a GUI intense project, may make sense to develop your custom UI that fits your needs, instead to force another developer approach to fit your requirements and ideas.
