The simplest way to create forms

 https://tally.so/

New SaaS drag-and-drop web form builder. Not sure about the business model, since it's free. 

An HTML attribute potentially worth $4.4M to Chipotle

https://cloudfour.com/thinks/an-html-attribute-potentially-worth-4-4m-to-chipotle
good post-mortem on a defective web form

another hosted forms provider

https://admin.typeform.com/
another hosted forms provide like wufoo or google forms. 

Craft beautiful forms in seconds

https://ohmyform.com/
opensource form software

A deeply customizable form and survey kit for your app

https://tripetto.com/
higher-end web form/survey tool: higher-end than surveymonkey? Wish they had pricing.