My project right now is #BikeHopper, an open-source directions app for transit+bikes.

https://github.com/bikehopper/bikehopper-ui

It uses #OpenStreetMap and a modified version of GraphHopper.

Two main benefits over other trip planning apps:
1. Bike-on-bus, bike-on-train etc. options
2. Tries really hard to find low-stress routes, avoiding main roads