Survey Monkey - Create and publish online surveys in minutes, and view results graphically and in real time. SurveyMonkey provides free online questionnaire and survey software.

Unity Ads - Unity Ads allows to supplement the existing revenue strategy by allowing to monetize thr entire player base.

Typeform - Create beautiful, next-generation online forms with Typeform, the form & survey builder that makes asking questions easy & human on any device. Try it FREE!

MoPub - MoPub is a mobile monetization platform that helps publishers drive more revenue from advertising and mobile transactions.

Google Forms - Simple web forms from Google.

Appodeal - Appodeal is a supply-side platform for mobile apps, that serves and protects publishers rather than advertisers.