A method of operating a build system includes, in a build engine, concurrently executing a plurality of build processes for corresponding heterogeneous builds, the build processes generating respective streams of build progress information in a build engine output. A build monitor process is executed which is configured and operative at regular intervals to (1) collect current-interval build progress information from the build engine output, and (2) use the current-interval build progress information to refresh a build-organized summary on a user interface device, the build-organized summary having distinct display sections summarizing build process history for the respective build processes.