Encryption

KeyNote NF offers a tabbed notebook with a rich-text editor, nested notes, and encryption, according to its project description.

Minisign signs files and verifies signatures through a simple command-line tool.

Kopia backs up data across Windows, macOS, and Linux with incremental backups, client-side encryption, compression, and deduplication.

BorgBackup is a deduplicating backup program with compression and authenticated encryption, described as free software.

This OpenPGP page lists email applications that support the standard directly or through additional software, across several desktop platforms.

CyberChef provides browser-based tools for encryption, encoding, compression, and data analysis.

With backup and sync, Stingle Photos offers a gallery and camera app; its page says photos and videos are encrypted before storage.

Portable Secret creates self-contained HTML files that decrypt messages or files locally in a browser using a password.

Photok provides a private photo vault for Android, storing selected images behind an app interface.

Mailvelope adds PGP end-to-end encryption to Gmail and other webmail services, with options for private users and organizations.

Encrypt email and files on Windows with Gpg4win, a software package based on GnuPG.

Tuta Calendar encrypts schedules and events, with personal and business account options listed on its calendar service page.

Search, upload, and manage OpenPGP keys through keys.openpgp.org, a key service powered by Sequoia-PGP.

Wire supports secure messaging and team collaboration with communication tools for organizations.

Wormhole shares files with end-to-end encryption and links that expire automatically.

This GitHub list curates cryptography resources and links for people exploring the field.

Online Tools offers browser-based utilities for hashing, encoding, encryption, formatting, compression, file processing, and more.

TangoShare transfers files between devices peer to peer with end-to-end encryption, without accounts or registration.

Let’s Encrypt is a nonprofit that provides automated TLS certificates for securing websites with HTTPS.

Encrypt files with age, a tool and Go library that uses small explicit keys and avoids configuration options.

VERNAM encrypts files in the browser; its project says processing happens client-side and files are not uploaded.

This RSA calculator supports prime generation, encryption, and decryption.

Set up a personal VPN server in the cloud using Algo, an open-source project from Trail of Bits.

Tomb makes strong encryption easier for everyday use by creating locked folders that can be transported and hidden in a filesystem.