Ipfs is a really cool useful project.

Filecoin is cool for super cheap longterm cold archives

Helium is well. I have mixed feelings about it.

Akashnet is a cool decentralized marketplace for docker container deployments.

There are a few peer to peer decentralized vpn things here and there.

There are tons of projects that are cool in concept but I really have to say you are more likely than not to lose money if you speculate on any tokens attached to the projects.