Windows, Mac OS X, Linux
Upverter's central parts library is constantly being updated by other hardware engineers on Upverter. This means that outdated components that have been edited will also be re-usable by other engineers on the platform. Every iteration that's been made on a part can be viewed in its history, allowing designs that require an older model of a component to use the existing symbol, footprint, and any other attributes.
Private Libraries give you the option of “locking” a part's version and storing it in a personal library associated with your account or team. You'll still be given the option of seeing any recent edits to the part in the central library and have the version you have automatically updated with a single click. This ensures that you're always working with the correct and desired version of a part for your project.