There is Sia/Skynet which I think is really cool. Sia is the decentralized storage layer and Skynet provides file-sharing and HTTP-access through webportals. It's actually working and can compete with AWS S3 in terms of security, performance and price, while being completely decentralized. Check out https://siasky.net and the Skynet App Store: https://siasky.net/hns/skyapps/#/apps/all