in English:
https://nano.org/en
in French:
https://courscryptomonnaies.com/nano

A DAG based system, which replaces the TANGLE from IOTA with a system called "block lattice".
This is how far I could get from a quick look, just reading 

As d5000 layed out, the double-spend problem is not really solved (and PoS system based is centralized, aka against the idea of Bitcoin), I would see this more related to IOT and similiar, than for "Bitcoin replacement".
probably s.th. which belongs into the altcoin section.

Edit: there is a PoW component: "Unlike Bitcoin, the PoW in Nano is simply used as an anti-spam tool, similar to Hashcash".
Whitepaper is here: https://nano.org/en/whitepaper

Edit2: and the technical discussion is here: https://bitcointalk.org/index.php?topic=1219264.0