All libraries Pax Instruments uses.
The library PaxInstruments-SparkFun.lbr is a compilation of work from SparkFun and is thus licensed under Creative Commons ShareAlike 4.0 International. You can download the latest version of their entire set of libraries from https://github.com/sparkfun/SparkFun-Eagle-Libraries
For all other libraries: To the extent possible under law, Pax Instruments has waived all copyright and related or neighboring rights to Pax Instruments Eagle Libraries. This work is published from: United States. For further information see http://creativecommons.org/about/cc0