Market Research:

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.