Google Trends – Google Trends gives you insights on search-terms, you can also compare the volume of searches between two or more terms.
Validately – Validate demand or usability on a clickable prototype or live feature with Validately.
Crunchbase – CrunchBase is the world’s most comprehensive dataset of startup activity and it’s accessible to everyone.
AngelList – Where the world meets startups. Find a great startup job, invest in a startup or raise money.
GutCheck – GutCheck is an on-demand market research solution delivering quality real-time insights from your target audience.