Latest Stable Nxt Client: Nxt 1.12.2
...newer PoS algorithms do not improve much over NXT’s implementation; rather they merely add a lot more moving parts, making it impossible to establish whether these algorithms actually work as designed... It was NXT that implemented the first pure Proof of Stake system...
...NXT ($NXT) was our first cryptocurrency born in 2013 when almost all alt coins were clones of the Bitcoin code. NXT blockchain software was written from scratch in Java and implemented the Proof of Stake consensus algorithm successfully for the first time in history. Its name means that NXT is the “next” thing after Bitcoin.... [NXT] was born as a blockchain for solving the energy waste and difficulty of use of Bitcoin and its clones...
On Sept. 22, a Dutch court ruled against Apollo for cloning over 75% of its code from Jelurida’s Nxt (NXT) blockchain software code but failing to adhere to the developer’s Jelurida Public License (JPL). JPL permits other developers to freely use and modify Jelurida’s code for the Nxt blockchain — but its terms stipulate that they must keep it in the “copyleft” spirit of open source and distribute their derived products under the conditions of the public license.
