X11 is a chained hashing algorithm approach, taking 11 hashing algorithms from the sphlib. Created by Evan Duffield, X11 consists of blake, bmw, groestl, jh, keccak, skein, luffa, cubehash, shavite, simd, and echo.
NIST5 is more efficient than X11 with GPU. And for now is ASIC restirant, and X11 no.
This algo uses the 5 finalists of the NIST SHA-3 competition, the National Institute of Standards and Technologies (NIST) selectioned the 5 best algorithms for their performance and other hash functions did not pass to Final Round, it's not a good way to add all hash algorithms, some have flaws and some performance problems