During the past summer, we've consolidated the COTS parts we use in CAD into the following part library. It includes most VEXpro parts, all VEXpro and AndyMark wheels, some 80-20 parts, the common sizes of pistons we use, detailed and simplified electronic components. It doesn't include any products released for the 2016 season since I haven't had time to update it yet.
Parts are organized into folders by categories, and vendor names / part numbers were included in the file names as much as possible. Parts should also have specified materials / weights (when provided) and standardized colors.
I downloaded all the parts from their respective websites but occasionally had to make slight changes due to issues with the STEP files. I also converted assembly files into single parts to reduce the clutter of our final assemblies. While I believe all the files are still accurate representations, I can't guarantee it.
Feel free to use it, modify it, or do anything else with it that you'd like. I hope you will find it useful, and let me know if you have any questions or find any mistakes in it.
Links:
- GrabCAD (SolidWorks or neutral format downloads)
- Google Drive (zipped folder of SolidWorks files)
- Documentation (complete list of parts included, notes, naming system, etc.)
...we are all winners when people come out of this program and strive to make the world a better place. - Patrick Wang [more] 
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