Blender
Blender 3d
Download Blender: https://www.blender.org/download/
Download Wayne Campbell's updated v3.5 exporter: http://www.elvastower.com/forums/index.php?/files/file/2251-blender-to-msts-exporter/
Blender 3d Tutorials and other stuff that I found helpful
Understanding MSTS model hierarchy: http://msts.steam4me.net/tutorials/ro_gmax_12.html
BornCG: Blender 2.7 Tutorial #1 : Navigating in 3D & The Basics: https://www.youtube.com/watch?v=zHdTUJBs7so
BornCG: Blender 2.7 Tutorial #2 : Understanding the User Interface & Preferences: https://www.youtube.com/watch?v=qlj_4nlJWpo
BornCG: Blender 2.7 Tutorial #3 : Building a Snowman: https://www.youtube.com/watch?v=ywVN__LjuyU
BornCG: Blender 2.7 Tutorial #4 : Saving & Recovery: https://www.youtube.com/watch?v=bcHS4GdZXzc
BornCG: Blender 2.7 Tutorial #5 : Intro To Edit Mode: https://www.youtube.com/watch?v=CziKzMDDvHM
BornCG: Blender 2.7 Tutorial #6 : Box Modelling a Cartoon Head: https://www.youtube.com/watch?v=ifFD8iD976g
BornCG: Blender 2.7 Tutorial #7 : The Mirror Modifier: https://www.youtube.com/watch?v=3LwQO_tWTAQ
BornCG: Blender 2.7 Tutorial #13 : UV Mapping (Unwrapping for Image Textures): https://www.youtube.com/watch?v=Tovu1A0LxeQ
BornCG: Blender 2.7 Tutorial #15 : Linking Objects (Parent/Child): https://www.youtube.com/watch?v=fPRda2TONCw
BornCG: Blender 2.7 Tutorial #16 : Joining & Separating Objects: https://www.youtube.com/watch?v=FIfwMEDMGz8
BornCG: Blender 2.7 Tutorial #18 : Edge Slide & Vertex Slide: https://www.youtube.com/watch?v=ZH1WLRNrw8g
BornCG: Blender 2.7 Tutorial #19 : The Bevel Tool: https://www.youtube.com/watch?v=yHh-Xj6wHDg
BornCG: Blender 2.7 Tutorial #20 : The Inset Faces Tool: https://www.youtube.com/watch?v=MjhiP8eFL3o
BornCG: Blender 2.7 Tutorial #21 : Dissolve & Limited Dissolve: https://www.youtube.com/watch?v=hnRoEKpt37k
BornCG: Blender 2.7 Tutorial #22 : Joining, Merging & Filling Holes: https://www.youtube.com/watch?v=LQFZU8VGBDI
BornCG: Blender 2.7 Tutorial #23 : The Knife Tool: https://www.youtube.com/watch?v=SW6JIWIVhhY
BornCG: Blender 2.7 Tutorial #24 : Solidify: https://www.youtube.com/watch?v=AESkUtUrQmg
BornCG: Blender 2.7 Tutorial #25 : Symmetrize: https://www.youtube.com/watch?v=q78HcmDAd5s
BornCG: Blender 2.7 Tutorial #26 : Snapping & Removing Doubles: https://www.youtube.com/watch?v=PjRE5j3yu2s
BornCG: Blender 2.7 Tutorial #27 : The Boolean Modifier: https://www.youtube.com/watch?v=pcUe-ab_jQs
BornCG: Blender 2.7 Tutorial #30 : The Array Modifier: https://www.youtube.com/watch?v=3Ti-bytjWF8
BornCG: Blender 2.7 Tutorial #32 : Proportional Editing: https://www.youtube.com/watch?v=MrNVVHdKd3E
BornCG: Blender 2.7 Tutorial #33 : Sharp Edges on Smooth Objects: https://www.youtube.com/watch?v=2x5y46W7UiU
BornCG: Blender 2.7 Tutorial #51 : Boolean Intersect Tool: https://www.youtube.com/watch?v=r30sSN1fYFo
BornCG: Blender 2.7 Tutorial #65 : Knife Project Tool: https://www.youtube.com/watch?v=UjTe0ctaoOs
Aaron Wiesinger: Blender : Edge split modifier and auto smoothing: https://www.youtube.com/watch?v=my5B2eejnaY (auto smooth it doesn't)
Ryan Green: Duplicating objects in Blender: https://www.youtube.com/watch?v=2x5y46W7UiU
Rocz3D: Baking an ambient occlusion map in Blender: https://www.youtube.com/watch?v=YfLWrPmcXHo
XRG81: Tutorial - Hand Painted Textures in Blender: https://www.youtube.com/watch?v=L7ALfRw6I5I&t