authors.txt

unpackbootimg, mkbootimg:
https://github.com/CyanogenMod/android_system_core/tree/cm-10.2/mkbootimg (initial sources)
https://github.com/huaixzk/unpackbootimg (makefiles)
https://github.com/osm0sis/mkbootimg (patches)

mkbootfs:
https://github.com/CyanogenMod/android_system_core/tree/cm-11.0/cpio (initial source)
https://github.com/trevd/android_system_core_cpio (makefile)
https://github.com/osm0sis/mkbootfs (patches)

unpackelf:
http://forum.xda-developers.com/xperia-z5/development/root-automatic-repack-stock-kernel-dm-t3301605 (initial source)
https://github.com/osm0sis/unpackelf (patches)

mkmtkhdr:
https://github.com/omnirom/android_device_oppo_r819/tree/android-4.4/mkmtkbootimg (initial source)
https://github.com/osm0sis/mkmtkhdr (patches)

lokitool:
https://github.com/djrbliss/loki (initial source)
https://github.com/osm0sis/lokitool (patches)

bzip2, chmod, cpio, cut, dd, file, gzip, lzop, xz;
cygbz2-1, cyggcc_s-1, cygiconv-2, cygintl-8, cyglzma-5, cyglzo2-2, cygmagic-1, cygwin1, cygz:
http://cygwin.com/

lz4:
http://lz4.github.io/lz4/

magic:
http://www.darwinsys.com/file/

androidbootimg.magic:
osm0sis@xda-developers

batch scripts:
osm0sis@xda-developers (scripting)
Peteragent5, alansj & iridaki@xda-developers (general method)
SuperR. & tobias.waldvogel@xda-developers (kernel.elf to boot.img general method)