A powerful hashing library with features like dynamic bucketsize adjustments, thread safety, generic interface, rbtree bucket storage and a bundle of hashing algorithms.
Finally hash tables which actually care about collision strategies, against algorithmic complexity attacks. And it even includes bloom. Modern open addressing schemes are not here (robin-hood, hopscotch, ...), but rbtree should be good. I'm only missing sorted arrays, which should have better cache performance, and CPU optimized hash functions (crc32 instrinsics, SIMD)
Good ready to use hash table implementation- Really saves time not reinventing the wheel