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Koofr is a cloud storage service offering tools for file organization, productivity and online collaboration. It is accessible through the web, desktop, mobile, WebDAV protocol or Rclone, without individual file size or file type limits. Koofr Vault is described as an open source, client-side, zero-knowledge encrypted storage application by Koofr.
File vault and cloud storage with end-to-end encryption and a zero-knowledge design for syncing private files across supported devices.
A free, continuously evolving downloadable book collecting community knowledge on 2D game development. It does not teach a specific tool, instead offering tips and tricks applied to any engine or built from scratch. Editions are available in pseudocode, Python, C++, JavaScript, Lua and Rust; some versions require thorough revision.
Aionda Mail is a German groupware service offering email, calendar and contacts, end-to-end encrypted with post-quantum cryptography. Accounts can create unlimited addresses, and an AI assistant is enabled by default on the provider's own servers and can be turned off. Zero-knowledge encryption is described. A Plus plan lists an encrypted mailbox, unlimited addresses and custom domains.
Filen is a cloud storage service built around zero-knowledge end-to-end encryption, with client-side encrypted storage for individuals. It offers features for syncing, sharing and organizing data, including a network drive and Smart Sync. Paid plans range from 200 GiB to 10 TiB of storage; a free tier starts with 10 GiB of space.
Secure zero-knowledge encrypted file sharing (AES-256-GCM in-browser). No account required, MIT licensed, self-hostable, optional link expiry.
Icedrive is a cloud storage service offering 10GB of free storage and paid plans. It provides web, desktop and mobile apps, a drive mounting tool that makes cloud storage appear as a local drive, and zero-knowledge client-side encryption. Plans list storage quotas and file version retention periods.
Internxt is a cloud storage service that encrypts files before they leave the user's device using zero-knowledge AES-256 encryption. The code is published on GitHub for independent review. A free plan offers 1 GB of encrypted storage, and paid plans are advertised starting at €9.99 per month. Apps are offered for Linux, Windows, macOS, iOS, Android and the web.
MEGA is an encrypted cloud storage service offering free storage, secure file upload, download and sharing, private chat and meetings, plus a VPN and password manager. It uses zero-knowledge encryption so only the data owner and authorised users hold the keys.
PrivateBin is a minimalist, open source online pastebin in which the server has zero knowledge of stored data. Data is encrypted and decrypted in the browser using 256-bit AES in Galois Counter mode. It is a fork of ZeroBin and allows setting a password required to read a paste. For security, an installation has to be used over HTTPS.
Tuta Calendar is an encrypted calendar that organizes events with end-to-end encryption and a zero-knowledge architecture. It offers push notifications, two-factor authentication, and sharing of calendars and events. Apps are available for Android, iPhone, and open source desktop clients for Windows, macOS and Linux. It is also integrated with email.
zkBob is a Web3 smart-contract privacy wallet based on zero-knowledge proof technology. It supports private peer-to-peer transfers and private multitransfers of up to 127 in one transaction, plus a cross-chain exchange widget. It supports USDC on Polygon and ETH and USDC on Optimism, with additional tokens and networks planned.
