Openrouteservice is free and will stay free - for everyone

Free Plan

Directions (2.000 requests per day @40 requests per minute)
Isochrones (500 requests per day @20 requests per minute)
Matrix (500 requests per day @40 requests per minute)
Optimization (50 requests per day @10 requests per minute)
Elevation points (200 requests per day @100 requests per minute)
Elevation linestrings (2.000 requests per day @40 requests per minute)
Geocoding (1.000 requests per day @100 requests per minute)
Reverse Geocoding (1.000 requests per day @100 requests per minute)
Points of interest (500 requests per day @40 requests per minute)
Commercial use allowed
Asset tracking allowed