Ledger Nano S can be used with many wallets. Check out it's use with MyEtherWallet.
Litecoin is a peer-to-peer Internet currency that enables instant, near-zero cost payments to anyone in the world. Litecoin is an open source, global payment network that is fully decentralized without any central authorities.
NEM is the world's first Smart Asset blockchain. Built from the ground up for enterprise-grade performance, NEM's blockchain technology delivers a world class platform for management of almost any kind of asset: currencies, supply chains, notarizations, ownership records and more. NEM’S power is exposed through a straightforward and secure developer interface so that you can deploy your blockchain solution in record time.
Decred is an open and progressive cryptocurrency with a system of community-based governance integrated into its blockchain. Decred attempts to create a better balance of power between miners and users by allowing users who don’t own a miner to participate directly in the network consensus and act as a check on miners. That involves a hybrid consensus mechanism of both PoW and Proof of Stake (PoS).
The incentive is, therefore: If I want to use IOTA, because the tech is incredibly helpful for my company, then I conduct a transaction and reference two other transactions per proof of work automatically. This alone is enough to provide the needed hash power because companies want to use IOTA.
Lumens are the native asset of the Stellar network. Native means that lumens are built into the network. Asset is how the network refers to an item of value that is stored on the ledger. One lumen is a unit of digital currency, like a bitcoin.