libopencm3
A free/libre/open-source firmware library for various ARM Cortex-M3 microcontrollers.
LPC17
Here is a list of all modules:
[detail level 12]
 LPC17xxLibraries for NXP Semiconductors LPC17xx series
 GPIOlibopencm3 LPC17xx General Purpose I/O
 PWRlibopencm3 LPC17xx Power Control
 LPC17xx DefinesDefined Constants and Types for the LPC17xx series
 Clock DefinesDefined Constants and Types for the LPC17xx Clock
 GPIO DefinesDefined Constants and Types for the LPC17xx General Purpose I/O
 Power DefinesDefined Constants and Types for the LPC17xx Power Control