Software Most Often Used in the Fab Lab

2D Design
Inkscape (inkscape.org): Free powerful vector-based graphics tool.
Gimp (gimp.org): Free pixel-based graphics tool (best for photographic files).
Google Draw (drive.google.com) - Free Web-based vector illustration program.

3D Design
Sculptris (pixologic.com/sculptris): Software for sculpting 3D files from scratch.
TinkerCAD (tinkercad.com): Cloud-based modeling environment.
NetFabb (netfabb.com): 3D model repair software (free to students and educators).
Makerware Desktop  (makerbot.com): 3D Printing preparation software. 

Free 2D Design Software

Inkscape (inkscape.org): Free powerful vector-based graphics tool.
Gimp (gimp.org): Free pixel-based graphics tool (best for photographic files).
Google Draw (drive.google.com) - Free Web-based vector illustration program.
Clikr (clkr.com): Free web-based vector art program.
Pixlr (pixlr.com): Free web-based (and desktop) bitmap editing software.
Paint.net (getpaint.net): Image and photo editing software for PCs that run Windows.

Free 3D Design Software

TinkerCAD (tinkercad.com): Cloud-based modeling environment.
Autodesk 123D (123Dapp.com): Suite of various 3D applications.
Sculptris (pixologic.com/sculptris): Software for sculpting 3D files from scratch.
MeshMixer (meshmixer.com): Software for manipulating 3D files.
MeshLab (meshlab.sourceforge.net): For editing 3D files for printing.
OpenSCAD (openscad.org): Parametric code-based 3D modeling environment.
BlockSCAD (blockscad.com): A drag-and-drop 3D modeling tool.
SketchUp (sketchup.com): 3D modeling software for professionals.
Sketchup-STL (github.com/SketchUp/sketchup-stl): Exports STL files.
Clara (clara.io): Cloud-based modeling, rendering, and animation environment.
3DTin (3dtin.com): Simple cloud-based 3D modeling environment.
Blender (blender.org): Modeling, animation, rendering, and game creation.
Form•Z (formz.com): Modeling software for architecture, and animation.
Houdini (sidefx.com): Procedural modeling environment.
MagicaVoxel (voxel.codeplex.com):A free lightweight 8-bit voxel editor.
VoxelBuilder (voxelbuilder.com): Cube-based 3D design for 2D and 3D printing.
SketchFab (sketchfab.com): Online library of 3D objects and VR environments.
eMachineShop (emachineshop.com): AutoCAD alternative.
Sculpt GL (stephaneginier.com): Linux & Windows browser-based mesh modeler.
3DP Rocks (3dp.rocks): 2D to 3D converter and 3D operations for novice users.

Digital Fabrication Websites

Thingiverse (thingiverse.com): For sharing 2D and 3D objects.
Shapeways (shapeways.com): For sharing, buying, and selling 3D objects.
Ponoko (ponoko.com): Web site for sharing, buying, and selling projects.
MakerCase (makercase.com): Generate SVG files for making boxes.

Digital Fabrication Locations in Chicago

Harold Washington Library (chipublib.org/branch/details/library/harold-washington)
Southside Hackerspace Chicago (sshchicago.org)
Pumping Station: One (pumpingstationone.org)
The 3D Printer Experience (the3Dprinterexperience.com)
Local 3D Printing (www.3dhubs.com)