Filecoin is the incentivization layer for IPFS. IPFS is sort of the go to decentralized storage solution these days, at least in the Ethereum space, but it has no guarantee of data availability. Filecoin hopes to address this by making contacts between users and providers (I think kind of like Sia, Storj, etc?). So the way it works is/will be pretty different from SAFE.
Swarm is also on the horizon in the Ethereum space. It has kind of fallen off the map in that you don’t hear much about it these days, but I’ve used it to build a decentralized website before, and I think they’re still developing. It is supposed to be the go to thing for Ethereum web3 in the future. It’s based on ‘swap, swindle, swear’ incentivization, where you just have to pay if you’re downloading way more than you’re seeding.
Other tangentially related protocols that I know of and didn’t mention yet are Secure Scuttlebutt (SSB) and dat.