SurveyCTO - Collect data you can trust Offline or online, in the field, on the street, or in the lab.
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!
DHIS2 - Manage aggregate data with a flexible data model which has been field-tested for more than 15 years.
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.
Open Data Kit - The Open Data Kit community produces free and open-source software for collecting, managing, and using data in resource-constrained environments.
Google Forms - Simple web forms from Google.