List of free insight stuff for developerππ½
If you're looking for all programming tools around insight (not just free). Check this page List of insight Programming Tools

Code Climate - Velocity
Velocity synthesizes the data from your repos to give you full visibility and empowers your team for continuous delivery.
Tag: workflow, remote, insight
Free for teams of up to 20 Repositories 50 Historical Data 3 Months GitHub, Bitbucket & GitLab integration

UserLeap
Continuously identify opportunities to acquire and retain more customers. Gain clarity into customer needs and grow your business.
Tag: insight, user-research
Up to 5k monthly tracked visitors Web, iOS, Android, and link microsurvey delivery Unlimited custom attributes and events Full template gallery