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abstreet
Transportation planning and traffic simulation software for creating cities friendlier to walking, biking, and public transit
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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.
I use Open Route Service https://openrouteservice.org/ to plot motorcycling routes - it seems to do what you are requesting - with gpx, kml, json exports
I've not heard about remix before, but some of its functionality seems similar to A/B Street which is aimed at comparing the effects of proposed changes on city traffic.
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Hence, a higher number means a more popular project.