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.
V12 Data - V12 Data offers rich data sets with verified addresses and emails for personalized marketing campaigns.
Qualtrics - Qualtrics is the most trusted research platform, helping brands make crucial business decisions. From surveys to insights to action.
Lotame - Make your data actionable, learn about your most valuable customers, improve ROI by targeting the right audience and increase relevance across screens.
Clearbit - Clearbit provides Business Intelligence APIs
Google Audience Center - 3 votes and 6 comments so far on Reddit