WARNING! You are responsible for your own encryption keys. If you lose them, they're gone forever and so is all of your encrypted data. No one can help you. With freedom comes responsibility.
PGP Encryption Software and PGP keystore. This is critical software to validate software that you download has not been tampered with. It's also used for managing public PGP email encryption keys of your contacts so that you can encrypt email you send them. You can also create and manage your OWN PGP private/public keys. This is NOT decentralized software. It's just software, but it is critical for any software you install that handles your money or cryptocurrency.
GPG4Win will work without centralized DNS.
It will work without central servers.
User accounts are self-hosted, meaning the user is in full control. It's unknown or is not applicable if GPG4Win supports cryptocurrency monetization.