blake2 provides the fast and secure hash function
blake2b (optimised for 64 bits architecture). You can find more details on the original library on https://blake2.net/ and the bindings on https://gitlab.com/nomadic-labs/ocaml-blake2
uecc (read “micro-ecc”) implements eliptic curve primitives (specifically ECDH and ECDSA). You can find the original library on https://github.com/kmackay/micro-ecc and the bindings on https://gitlab.com/nomadic-labs/ocaml-uecc
hacl implements multiple cryptographic algorithms. The original library, HACL*, developed in F*, can be found on https://github.com/project-everest/hacl-star, and the bindings on https://gitlab.com/nomadic-labs/ocaml-hacl
These releases are part of a broader effort to release in-house bindings and libraries and upstream changes to vendored libraries. Look out for our past and future announces.