Self-hostable

Open-source messenger with no user identifiers at all — no phone number, email or account. Metadata-minimising by design and self-hostable.

End-to-end encrypted collaborative documents and drive. You can use it without an account, and it is open source and self-hostable.

Minimalist open-source pastebin where the server has zero knowledge of the data — text is encrypted in the browser. No account.

Open-source Bitcoin blockchain and mempool explorer you can self-host or reach over Tor. No account, and self-hosting avoids leaking which addresses you look up.

Open-source metasearch engine that aggregates results without profiling you. Use a public instance or self-host; no account.

Open-source client for the decentralized Matrix network. Many homeservers allow registration without a phone number or email, and you can self-host.

Free, open-source Lightning wallet and accounts system you can self-host to run your own no-KYC payment stack.

Open-source anonymous email forwarding (formerly AnonAddy). Generate unlimited aliases that forward to your real inbox; self-hosting supported.

End-to-end encrypted notes app, open source and self-hostable. A free account needs only an email, and paid plans can be bought with crypto.

Open-source email aliasing that hides your real address behind disposable ones. Account creation needs only an email; self-hosting is also possible.