OSRM
project-osrm.orgHigh-performance open-source routing engine
Aimsun is traffic modelling from macro to micro simulation. Here are 14 other tools that do a similar job, 4 of them free or open source.
Macroscopic transport planning and travel demand modelling
Free routing, isochrones and matrix API on OpenStreetMap
Maps, search, routing and traffic APIs from TomTom
High-performance open-source routing engine
Transit and street planning platform
Transportation analytics from big mobility data
Conceptual design for infrastructure in real-world context
Accessibility analysis for transit and land use scenarios
Land use and real estate market simulation for regions
Routing engine and route optimization API
Open-source microscopic traffic simulation
Aggregated public transit data from thousands of agencies