Free Tree generator (only Windows) with settings!  :)
(There are some trees yet done! Export OBJ, dbo, x:)

No need to press the "Generate" button unless you put branches and leaves!

http://www.evolved-software.com/treeit/treeit


And you can of course load any PNG images with transparent background as "leaves"!
(even if not indicated in the drop-down menu files)

If you want to put native dds formats (Direct Draw Surface) you will have to use PaintNet to create some!
https://www.getpaint.net
Here my try! :)