Here are a few software projects to have a look at:
IXSI
Interface for X-Sharing Information documentation. A XML and Websocket-based interface standard to integrated sharing services into travel information.
X-Sharing Services Router
An add-on for the X-Sharing Services Integrator which offers routing information for the integrated mobility services.
SteVe
SteVe - Steckdosenverwaltung. A lean management system for electric charging stations using OCPP.
BikeMan
BikeMan - Bike Manager. A lean management and backend system for pedelec rental stations.
BarTi
BarTi - Barcode Ticket Server. A web service to issue VDV-KA conforming 2D barcode tickets with a static validity.