Google Maps directions.

Pick a start and end point using the following options:

• Current Location
• Home Address
• Work Address
• Address of a contact in your address book
• Address of an upcoming appointment
• Search for a local business (e.g. “Pizza”)
• Search for something else (e.g. “Houses of Parliament”)

Travel mode can be driving, public transport, walking, or cycling.

For all modes except public transport you can choose additional waypoints on your journey (Google Maps unfortunately doesn’t support multi-stop planning for public transport).