You want to literally own your files? This is something won't happen on traditional cloud services in a lifetime. And this is something is going to happen in a glance with "Fx Files" app from now on. It is a file manager which stores everything on Fula blockchain network of Bloxes.
Secret.NET (port of the secret.js Client) is a .NET Client to interact with the Secret Network blockchain (L1 / Cosmos based), the first privacy smart contract blockchain that processes and stores data on-chain in encrypted form (SGX). See also https://scrt.network/ https://github.com/scrtlabs/secret.js
Polkadot ecosystem explorer that can be used to explore any Substrate-based blockchain. It is written in .NET and is available as a web and mobile application.