Language	Project	Maintainer	License	Status	Features / Notes	Implementation
Dafny	Eth2 spec/verif. with Dafny	ConsenSys Software And Ethereum Foundation (grant)	Apache-2.0	Active	Formal spec., correctness proofs	ConsenSys/eth2.0-dafny
Go	ZRNT	Diederik Loerakker (@protolambda)	MIT	Active	Generic, caching, datasharing	protolambda/ztyp
Go	Prysm	Ferran Borreguero (@ferranbt)	MIT	Active	Code-gen, fast	ferranbt/fastssz
Java	Teku	Consensys/PegaSys Eng.	Apache-2.0	Active	Caching, datasharing	PegaSysEng/teku/ssz
Nim	Nimbus	Status	MIT and Apache-2.0	Active	In-place decode, Caching	status-im/nim-beacon-chain/ssz.nim
Python	Trinity	Ethereum Foundation	MIT	Active	Pyrsistent, partial caching	ethereum/py-ssz
Python	Pyspec / Eth2.py	Diederik Loerakker (@protolambda)	MIT	Active	Datasharing, caching, streaming	protolambda/remerkleable
Rust	Lighthouse	Sigma Prime	Apache-2.0	Active	Partial caching, fast	https://github.com/sigp/lighthouse/tree/master/consensus/ssz
Typescript	Lodestar	Chainsafe Systems	LGPL-v3.0	Active	Both Tree & structural, caching	ChainSafe/lodestar/ssz
Zig	-	Guillaume Ballet (@gballet)	Unlicense	Active	No merkleization (yet)	gballet/ssz.zig
C#	Cortex	Sly Gryphon (@sgryphon)	LGPL-v3.0	Under construction	Experimental	sgryphon/cortex-ssz
Go	Prysm	Prysmatic Labs	MIT	Deprecated	Generic, reflection, known bugs	prysmaticlabs/go-ssz
Go	ZRNT	Diederik Loerakker (@protolambda)	MIT	Deprecated	Unsafe Go, fast, streaming	protolambda/zssz
Java	Harmony	Harmony	Apache-2.0	Deprecated	Partially merged into Teku	harmony-dev/beacon-chain-java/ssz
TypeScript	Lodestar	ChainSafe Systems	Apache-2.0	Archived	See new Lodestar SSZ	ChainSafe/ssz-js
Rust	Shasper	ParityTech	GPL-3.0	Discontinued	No updates	paritytech/shasper/ssz
Swift	Yeeth	Dean Eigenmann (@decanus, @yeeth)	MIT	Discontinued	Incomplete	yeeth/SimpleSerialize.swift
Java	Cava	ConsenSys	Apache-2.0	Discontinued	Outdated, incomplete	ConsenSys/cava/ssz