MassBank is an Open spectral library used in e.g. Metabolomics
The software plattform is developed in https://github.com/MassBank/MassBank-web
The record format is spcified in https://github.com/MassBank/MassBank-web/blob/master/Documentation/MassBankRecordFormat.md
Data is version-controlled on https://github.com/MassBank/MassBank-data/
An example record would be https://github.com/MassBank/MassBank-data/blob/master/Eawag/EA000401.txt
There are some converters to/from MassBank in https://github.com/MassBank/MassBank2NIST
E.g. the "Bruker Sumner MetaboBASE Plant Library" was converted from https://www.bruker.com/service/support-upgrades/software-downloads/mass-spectrometry/metabobase-plant-libraries.html (requires login) to these records: https://github.com/MassBank/MassBank-data/tree/master/BS
The Bruker *.library format is sortof derived from MSP,
the extended format is defined in ASCII MS Spectrum File format.pdf (no link available) by Bruker.