Brian Sidebotham's - Raspberry-Pi Bare Metal Tutorials
https://github.com/BrianSidebotham/arm-tutorial-rpi
armc-cstartup.c
armc-cstubs.c
rpi-base.h
rpi-interrupts.h
rpi-interrupts.c
rpi-mailbox.h
rpi-mailbox.c

David Banks' PiTubeDirect (GNU General Public License v3.0)
https://github.com/hoglet67/PiTubeDirect
defs.h
cache.h
cache.c
armc-start.S
startup.h
rpi-aux.h
rpi-aux.c
rpi-gpio.h (added GpioDetect)
rpi-gpio.c
rpi-mailbox-interface.h (Added some missing ones)
rpi-mailbox-interface.c
linker.ld

R Stange's USPi
https://github.com/rsta2/uspi
uspi\*.*
exception.c
interrupt.h
interrupt.c
Timer.h
Timer.cpp

R Stange's modified version of John Cronin's EMMC controller
emmc.h
emmc.cpp

ChaN's Generic FAT file system R0.12b
http://elm-chan.org/fsw/ff/00index_e.html
ff.h
ff.cpp
diskio.h
diskio.cpp

Sean Barrett's stb_image (MIT) (used for loading PNGs)
https://github.com/nothings/stb
stb_image.h

FFmpeg  (LGPL v2.1+) (used for the font)
https://github.com/FFmpeg/FFmpeg
xga_font_data.h
xga_font_data.c

Pete Rittwage's (Markus Brenner's) NIB lib
https://c64preservation.com/svn/nibtools/trunk
gcr.h
gcr.cpp
prot.h
prot.cpp

Marcus Geelnard's LZ77 coder/decoder (GNU General Public License, version 2 or later)
https://c64preservation.com/svn/nibtools/trunk/lz.c
lz.h
lz.c


nbla000's CBM-FileBrowser_v1.6
http://www.nightfallcrew.com/21/08/2013/cbm-filebrowser-v1-6-by-nbla000/