This is simple, free and open source tool for planning routes, that is based on the Google Maps Api. It uses Google Places Api - SearchBox, AutoComplete, DirectionsService and other. It's built on top of knockout, require and jquery libraries. In fact, this is clone of the Google Maps Engine, and the key differences are:

• Unlimited layers, directions and markers per map
• Export/Import map to simple JSON object
• Setup does not require own hosting - it's possible just to copy files and open index.html locally in browser

Demo

Habrahabr article

I've spent about 20 hours for developing the v0.1, and implemented only the necessary functionality. There're a lot of things to do, but the current prototype suits me. So I decided that in case of any interest I'll spend some more time and:

• Refactor the code and switch google.mapsInfoWindow to the custom one, that works better with knockout
• Add draggable ability to directions service
• Add custom marker icons
• Add polylines and shapes
• Add image's uploader and parse POI photos and street view

And if You appreciate my work, feel free to contact me.