you can save forms with formit2db and create a CMP with MIGXdb to manage the form-subissions.
Not sure, how this is working together with formitBuilder, but I think it should.
There is also migxFormbuilder, which does this all in one.
Build Forms, also multipage-forms are possible within the included CMP.
Generate the form and needed formit-calls with bloX (example-chunks included).
Manage the form-submissions with the included CMP.(Filter by formnames, export to CSV, print-view for formSubmissions)
https://github.com/Bruno17/migxFormbuilder
you will need to have MIGX, bloX and Formit installed.
there's no Docu, yet and there's still some work todo before official releasing it.
But its working allready well on some off my installations and you can get the idea, how you can combine MIGX, bloX and Formit for a working formbuilder.