The Product Management guide - A book on how to create and ship products that people love

Respondent - Respondent helps you find any target audience in the world for in-person and remote research studies across all research methods including interviews, focus groups, surveys, and more. Respondent works with any research tool you already use.

Intercom on Product Management - The ultimate resource for aspiring product managers

Startquestion - Say goodbye to boring surveys and forms.

Xobin - Most Comprehesive Pre-Employment skills testing and Psychometric Assessment Platform.

Qualaroo - Qualaroo makes it easy to survey specific groups of website visitors to gain qualitative information.