When people start these tokens they make promises that claim to solve real-world problems, and only a few of them actually fulfill their promises. But I found a guy who listed some of the biggest ones that have a real usage:

- Ripple, which aims to replace the SWIFT interbank payment system with instant transactions and reduced fees per transaction.
- Stellar, pursuing a few of the same goals as Ripple while targeting individuals with the goal of banking unbanked customers around the world.
- Factom, wanting to offer a decentralized platform for notaries.
- Golem, the whose stated goal is to become a kind of Airbnb of computing power. The platform lets users sharing some computing power and is based on the Ethereum platform.
- Basic Attention Token, which aims to revolutionize the world of digital advertising with an innovative model that benefits advertisers, publishers, and users.
- Siacoin, offering a fully decentralized cloud storage platform.

I checked Siacoin, they seem to already release their platform and people are using it.