SurveyCircle - SurveyCircle is the world’s largest community for mutual support in online research – helping students, PhD candidates, researchers, founders, and startups to find survey participants for research studies and market research surveys.
Crunchbase - Crunchbase is a platform for discovering industry trends, investments, and news about companies around the world.
SurveySwap - Find survey participants for free. help each other by taking each other's surveys.
CB Insights - CB Insights is a company database for the venture capital and corporate development community.
PollPool - PollPool gives you access to survey participants for empirical research. Easy, fast and for free!
Owler - Owler is a crowdsourced data model allowing users to follow, track, and research companies.