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Sign and verify using publicly available SSH keys, right in your browser!
While GPG isn't that common, and is a pain, everybody with a GitHub account should have a SSH key. This program makes it easy to sign things with it.
Note that no server is involved, except for optionally fetching public keys from GitHub; everything happens in your browser.
Disclaimer: I'm not a crypto expert. This program hasn't been audited. No guarantees.