Compress or decompress RPL/RPX files for Wii U.
# decompress:
wiiurpxtool -d <rpx_name> [out_name]
# compress:
wiiurpxtool -c <rpx_name> [out_name]
LLVM
zlib
Hykem (documentation and research of the RPL/RPX format)
Mark Adler (zlib header files)