The Fowler-Noll-Vo checksum algorithm is another simple and fast checksum. It comes in 32, 64, 128, 256, 512 and 1024-bit versions, each in 1 and 1a variants. The 1a variants tend to produce a slightly better result. See http://en.wikipedia.org/wiki/Fowler_Noll_Vo_hash for more details.
fnv1-32
fnv1a-32
fnv1-64
fnv1a-64
fnv1-128
fnv1a-128
fnv1-256
fnv1a-256
fnv1-512
fnv1a-512
fnv1-1024
fnv1a-1024