SBA | List of data sources: https://www.sba.gov/business-guide/plan-your-business/market-research-competitive-analysis#section-header-4
The Ewing Marion Kauffman Foundation, a non-profit that provides resources to support entrepreneurs, offers a list of data resources: https://www.kauffman.org/entrepreneurship/research/data-resources/#:~:text=data%20sources%20and%20other%20entrepreneurship%20databases.
If you are at a university or have alumni library privileges, many universities have access to paid subscription market research websites. Look for a guide to Business Market Research Databases.
Google Keywords can help you learn about the volume of keyword searches, how competitive those keywords are, and how keywords are related to each other. You’ll need a free AdWords account to access this data.
AUTM (non-profit leader in university tech transfer) collates the AUTM Innovation Marketplace, which lists over 26,000 university technologies currently available for licensing.
