Jafama
A (Strict)FastMath class with 1e-15ish accuracy.
...It is a strictfp version of FastMath (and not a fast version of StrictMath): for a same version of this library, its methods always return a same result for same arguments, which might not be the case for FastMath depending on JIT or other JVM optimizations.
Requires Java 5 or later.
Available on Central since 2015/06/05.
Also available on github since 2015/12/13:
https://github.com/jeffhain/jafama