Altitude0 Track Editor is a web browser tool created for Altitude0 game, air racing and it's easy to access and use.
It allows you to create your own tracks the way you want and share your creation. It runs in any modern web browser that supports WebGL (like Firefox or Chrome).
Tracks can be as wild as you want them to be: with different object selection, you can build exciting, interesting or challenging tracks. Currently Altitude0 Track Editor is available here: http://www.altitude0.com/a0editor