SpeedTree is described as 'Group of vegetation programming and modeling software products developed and sold by Interactive Data Visualization, Inc. (IDV) that generates virtual foliage for animations, architecture and in real time for video games and demanding real time simulations' and is a 3D Modeler in the photos & graphics category. There are more than 10 alternatives to SpeedTree for a variety of platforms, including Windows, Linux, Mac, Blender and BSD apps. The best SpeedTree alternative is Treeit, which is free. Other great apps like SpeedTree are ngPlant, powerPlant, GroIMP and Arbaro.
Tree It is an easy to use real time 3d tree generator for the simple creation of your very own 3d tree models for your dark basic pro and dark GDK apps and games.
It does a lot of what Speed Tree does
ngPlant is a plant modeling software package. ngPlant interactive tool can be used to create 3D models of different plants and trees. ngPlant software libraries can be used by developers in their 3D applications, or plant modeling plugins.
powerPlant is a plant modelling tool based on parametric plant descriptions, producing highly detailed models that can be exported to 3ds. Deriving similar plants is a matter of 1 click! Complete scenes can be composited with the integrated scene editor.
GroIMP (Growth Grammar-related Interactive Modelling Platform) is a 3D-modelling platform. As such, GroIMP contains features known from modelling software:
Arbaro is an implementation of the tree generating algorithm described in Jason Weber & Joseph Penn: "Creation and Rendering of Realistic Trees".
Grow natural 3D trees for visualisation and film. Grow, bend, prune, interactively simulate the seasons year by year. Build highly detailed 3D models.
Professional 3D Computer Graphics software to create, animate and render realistic 3D worlds, landscapes and natural environments
Xfrog is a procedural organic 3D modeller that allows you to create and animate 3d trees, flowers, nature based special effects or architectural forms. Xfrog is available as a Mac OS, Windows, and Linux plug-in for Maya, Cinema 4D and as a standalone...
this is an addon for blender3d which works pretty nice and isvery easy to use if you are familiar with nodes
Tree Studio is a product born from TwistedBrush Pro Studio but with a focus on 2D tree creation with a simpler, streamlined interface. Tree Studio has pairs of brushes for each tree type - one for the frame and one for the leaves.
Speedtree is to create 3D trees. Tree Studio is to create 2D trees only.
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It's not a abandon ware, so have some updates!