Mapbox - An open source mapping platform for custom designed maps. Our APIs and SDKs are the building blocks to integrate location into any mobile or web app.
OSRM - Utilities, Application Utilities, and Mapping APIs
QGIS - QGIS is a desktop geographic information system, or GIS.
FRRouting - FRRouting (FRR) is an IP routing protocol suite for Linux and Unix platforms which
ArcGIS - ArcGIS software is a data analysis, cloud-based mapping platform that allows users to customize maps and see real-time data ranging from logistics support to overall mapping analysis.
OpenRouteService.org - The spatial services API with plenty of features.