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:
https://github.com/tobiaswaldvogel/and_boot_tools/tree/master/bootimg (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)

loki_tool:
https://github.com/djrbliss/loki

futility:
https://github.com/jcadduono/platform_external_vboot_reference (initial source)
https://github.com/osm0sis/futility (patches)

blobpack, blobunpack:
https://github.com/AndroidRoot/BlobTools

bzip2, chmod, cpio, cut, dd, file, gzip, lzop, printf, tail, xz;
cygbz2-1, cygcrypto-1.0.0, 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)
_that & rayman@xda-developers (boot.blob general method)
Chainfire@xda-developers (ChromeOS and SEAndroid general methods)
cybojenix@xda-developers (Bump general method)
