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The Azure DevOps Server marketplace features the Commit Network extension (https://marketplace.visualstudio.com/items?itemName=swapme3.commitnetwork). This free extension, created by Swapnil Athawale, brings in visualization capabilities to the branch commits and the flow of code. Visualizations include the following: 

• Pie chart of code commits by members
• Flow network of commits
• Graphical representations of work by each member