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Dev tools · April 23, 2026

Project River

See how your codebase evolved, contributor by contributor

What it does

Project River turns raw Git commit data into an interactive streamgraph -- a flowing, color-coded visualization where each band represents one contributor and the thickness shows their activity over time. It's built for engineering managers, tech leads, and open-source maintainers who need to answer questions that GitHub Insights can't: Who are the quiet core contributors? When did a project's momentum shift? Is knowledge concentrated in too few people?

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