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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Use EasyOpenCV (EOCV) with a webcam. You can even use the AprilTag plugin for it, https://github.com/OpenFTC/EOCV-AprilTag-Plugin, it will make your life even easier. Vision is also more precise than a distance sensor for detecting something on a field.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.