You should abstain from any library that uses the naive "maximum absolute difference" approach (like Guava). As detailed in the Bruce Dawson's excellent article Comparing Floating Point Numbers, 2012 edition, it is highly error-prone as it only works for a very limited range of values. A much more robust approach is to use relative differences or ULPs for approximate comparisons.
The only library I know of that does implement a correct approximate comparison algorithm is apache.common.math.
