I read a post in Allan Brito blog about modeling tress and how 3dmax has a plugin to generate trees models [1]. I researched web a little about the subject and found Arbaro [2], a tree generator written in java which exports models in pov ray format (.pov) and wavefront (.obj). Fortunately blender reads .obj format and I could import the trees. The sofware has a lot of examples and parameters to play with, but I didn’t spend much time on it.

You can download it in any SO with compatible java version. The only problem I had was due to the outdated manual, which tells to type:

java -jar arbaros_gui.jar

For graphical interface and:

java -jar arbaro.jar -p pov/quaking_aspen.pov -o \
pov/quaking_aspen.inc trees/quaking_aspen.xml

for command-line execution. But the actual filenames are arbaros.jar instead of arbaros_gui.jar and arbaros_cmd.jar instead of arbaros.jar.

Reference:
[1] Criando uma árvore com subdivisão no blender 3d (pt)
[2] Arbaro – tree generation for povray