Speedtree is now in 4.3 https://www.unrealengine.com/blog/unreal-engine-43-release but costs another monthly 19 USD http://store.speedtree.com/product/speedtree-for-ue4/ and exported models can't be used with other engine. fortunately it does not require continuous subscription similarly to the engine.

the visual behaviour tree editor is magic laugh


Free world editor for 3D Gamestudio: MapBuilder Editor