Many third parties have created tools and other resources for developing openBVE addons. A brief list of these is below:

Note: Please see the respective pages for any licence conditions.

Track and Railway Structures:

TrackGen

TrackGen creates smoothly curved track (including pointwork), platforms and bridges.

TrackGen Screenshot

http://www.bvecornwall.co.uk/wordpress/trackgen/

Scenery

Forest Builder

Forest Builder generates forests, carparks etc.

http://www.bveklub.hu/forestbuilder/

Object Resources

BVE Klub Object Library

Various objects, including Hungarian trains, and more general scenery items.

http://bveklub.hu/objektumtar/

BVE Cornwall Objects

Assorted British rolling stock, buildings and cars.

http://www.bvecornwall.co.uk/wordpress/objects/

Celtic Trainsim ‘Freebies’

Assorted road traffic

http://celtictrainsim.com/freebies.html