I ended up creating my own, in yaml, with rails backend. Includes multiple nested field sets, fields shown/activated by other fields etc. The gist is: structu

I ended up creating my own, in yaml, with rails backend. Includes multiple nested field sets, fields shown/activated by other fields etc. The gist is: structure in yaml/json, then field code templates in partials, and validations on the back end. Included Salesforce list validations which was pretty neat. The code is nowhere near reusable unfortunately.