Some pgRouting applications:

• Paris By Remi-C
• Pedestrian Routing with Synthesized Footways
• Criando um aplicativo de rotas com pgrouting
• OpenLayers Routing, with a little help from my friends
• Snowmobile trails, Quebec
• Campus routing also over different floors, Switzerland
• Routing in the Roman Empire
• Bike routing service for the city of Milan
• geoSDI routing demo
• SBB fault monitor application, Switzerland
• Accessible paths in Pinhel
• Accessible streets municipality of Amsterdam based on limiting traffic signs, such as weight and vehicle type) Website and Github code

Commercial usages:

• Website that helps you find the safest bike route between any two points in New York City
• This site routes you from the highway exit to the closest Sushi restaurant in Niigata