Tutorials:

http://eat3d.com/
http://www.creativecrash.com/
High Quality 3D Models, Scripts Plug-in and More!
http://www.katsbits.com/
Is a
trusted and authoritative source for
Blender tutorials and training for the next level in the production of low poly game ready models.
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Forums:

http://www.polycount.com/
http://gameartisans.org/forums/
http://www.cgtantra.com/
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Scripts, Tools and Plug-ins/add-ons:
* P3d - The professional Web solution for displaying your 3D models. To use p3d.in you just need a modern web browser. No plugins, no third party
*
Itoosoft - Plugins for 3DS Max
free
*
Scriptspot - A common place for variety of cool 3DsMax and SketchUp scripts and plug-ins.
*
TexTools -
Cool UV manipulation Tools, Just drag and drop into the 3dsMax viewport,
By "Hendrik-Jan Schoenmaker".
*
UVMapper Professional is a stand-alone texture mapping utility for the creation and modification of UV coordinates for n-sided polygonal 3D models.
*With
UNFOLD3D unwrapping meshes has never been so easy : Just drag and drop your mesh to get its angle optimized UV mapping, Mark seams and unfold it. Less than one second for small meshes.
*
ATree3D is simple to use 3D plants generator for architectural visualizations.
With this script for 3ds max you can create trees, bushes, shrubs, flowers and grass. You can use it for low or high polygon models with precise control of the level of details on each sub-element. Script works inside of the 3ds max viewport and show instant preview of your changes.
free
Vegetation:
*
CanTree, a
free online 2D tree generator. By,
Arnaud Couturier
*GW:Ivy- ivy's are designed to grow in scenes with real-world scale !!
growing an ivy is actually as easy as writing a plugin. ivy-textures can be found at
Thomas Luft's Ivy Generator page
*
Speedtree - is a powerful toolkit used to create 3D animated plants and trees for games, animations, visual effects and more.
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Normal Map Creation Tools:
*Handplane3d - Handplane baker processes extremely dense models easily. Decimeting your zbrush sculpts takes longer than simply exporting and baking.
Pay what you want
*
Knald - Knald is a ground breaking, standalone, ultra-fast GPU powered solution for generating incredibly high quality textures from high to low polygonal meshes via The Baker or any 2d source texture from the real-time Color To Normals mode & the Normal & Height Maps provided by The Integrator. It provides the tools you need to reduce iteration times, increase the quality of your project & improve the productivity of your artists by integrating seamlessly into current physically based pipelines with Knald’s next generation feature set.
*
NVDIA Texture Tool for Adobe Photohsop - The NVIDIA Normal Map filter creates normal maps from grayscale height maps. It comes with NVIDIA DDS plug-in that allows you to open and save .dds files in RGB format.
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Crazybump - A Fast and Cool tool to generate Normal maps, Specular maps,Displacement maps, Ambient occlusion maps, from a given texture.
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Pixplant - This is a smart 3D texturing tool that creates high quality normal, displacement, specular maps and seamless textures from plain photos.
*Quixel - Scan based PBR texturing. In Photoshop. Unleash Photoshop's potential with a huge scan based material library and a responsive, fluid 3D (includes dDo, nDo)
*
dDo *
nDo - A normal Map creation Toolkit for Photoshop,
for quickly designing normal maps without ever leaving Photoshop, it is a melting pot of normal creation techniques. Sculpt using custom brushes, volumes from selections, paths or layers, apply filters, generate complexly multifaceted normal maps from height or photographs, rotate and transform without biasing normal – nDo is designed to cover many of our normal mapping needs in a to-the-point format, (this has a nice 3D preview in side of photoshop). By, "Teddybergsman" and "Philip Klevestav"
*
xNormals - A very friendly application to generate normal / ambient occlusion / displacement maps. Also projects textures of highpoly to lowpoly mesh with different topologies.
An absolutely free to use; includes its flexible SDK application.
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Blender:
*Cool Blender
Materials , get the "
.blend file".
*
Layer Manager Script - Blender buttons are represented by blank little buttons & here is a wonderful solution that provides welcomed functionality to the Blender interface. By,
Mariano Hidalgo (A.K.A. uselessdreamer)
*
Suicidator City Generator (SCG) a popular Blender addon to generate City meshes faster.
By,
Arnaud Couturier
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Cinema4D:
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Texture Sites:
The best place to find good Textures: