The answer is Lightning Network to your queries though not tied to one particular project as it's supported by many projects/coins.
Instant transaction time so doesn't really have a limit on TPS, infinitely scalable so again not limited. This tech is what will move crypto forward and there are teams out there pushing it forward.
As for an individual project pushing the tech on LN you should look at Stakenet. They have already performed Lightning Swaps which are Atomic Swaps over LN:
Atomic Swap = On-Chain and limited by respective blockchain confirmation times, blocksize and fees.
Lightning Swap = Off-Chain so instant, theoretically infinitely scalable with little to zero fee.
They did this publicly on their mainnet and provided a guide so anyone could try. This tech is important as it allows people to convert assets instantly P2P so no need for a trusted party like a centralised exchange. They are currently coding it into a 1 click solution for their new multicurrency wallet.
The new Multicurrency Wallet is special as it is super lightweight, usually you have to download entire blockchain for the assets you are holding but here their MN network will hold the blockchains and you interact with them via Lightning Invoices so the wallet can easily be used on any device like mobile with no huge downloads or waiting for syncing blockchains.
To add to this they are also using their Lightning Swap tech to build an entire DEX run off of their MN network which will be accessed in wallet. This is where you will be able to effortlessly convert assets while always keeping full control of them in your wallet right until the moment they are sold.
They have a network of nearly 2000 MN's so can't get much more decentralized than that really. Here is a little article about their new wallet/dex tech you should check out and then have a deeper look at all the other cool stuff they are doing with staking, hardware, privacy, dapps and more:
https://medium.com/stakenet/multi-currency-wallet-and-lightning-swaps-stakenet-solution-7d0dafe99105edit to add:
They are also collaborating with Litecoin Foundation to push LN forward:
https://litecoin-foundation.org/lightning-network-collaboration-with-x-9-developers/As Stakenet’s overall vision is to build an interoperable cross-chain future built on the LN, both parties incentives are aligned to work together