ActivityWatch is a free, open-source app that automatically tracks how you spend time on your devices. It’s privacy-first, cross-platform, and a great alternative to RescueTime, ManicTime, or WakaTime. Key features:

📊 Tracks app usage, websites, and overall activity automatically

🔒 Privacy-focused: all data stored locally, no external servers

💻 Cross-platform support: Windows, macOS, Linux, Android

⚙️ Highly extensible with modules and custom watchers

📈 Insightful stats and visualizations to improve productivity or spot bad screen habits

🌍 Community-driven, transparent, and free forever

Perfect for anyone who wants clear insights into their digital habits without sacrificing privacy.

Picocrypt-NG (New Generation) is a very small, very simple, yet highly secure file encryption utility. Designed to be the go-to tool for protecting sensitive files, it emphasizes security, simplicity, and reliability. Key features:

🛡️ Uses modern cryptography: XChaCha20 cipher + Argon2id key derivation

📦 Lightweight and portable — minimal footprint, no unnecessary complexity

🔒 Strong focus on security and reliability, with open-source transparency

⚙️ Easy to use: straightforward interface for quick encryption/decryption

🌍 Cross-platform support for everyday file protection needs

Perfect for anyone who wants fast, trustworthy encryption without bloat.

A simple, fast and free app to remove unnecessary files from your computer.

Features

• Written in memory-safe Rust - almost 100% unsafe code free
• Amazingly fast - due to using more or less advanced algorithms and multithreading
• Free, Open Source without ads
• Cache support - second and further scans should be much faster than the first one
• CLI frontend - for easy automation
• GUI frontend
• No spying - Czkawka does not have access to the Internet, nor does it collect any user information or statistics
• Multilingual - support multiple languages like Polish, English or Italian

Multiple tools to use:

• Duplicates - Finds duplicates based on file name, size or hash
  Empty Folders - Finds empty folders with the help of an advanced algorithm
• Big Files - Finds the provided number of the biggest files in given location
• Empty Files - Looks for empty files across the drive
• Temporary Files - Finds temporary files
• Similar Images - Finds images which are not exactly the same (different resolution, watermarks)
• Similar Videos - Looks for visually similar videos
• Same Music - Searches for similar music by tags or by reading content and comparing it
• Invalid Symbolic Links - Shows symbolic links which point to non-existent files/directories
• Broken Files - Finds files that are invalid or corrupted
• Bad Extensions - Lists files whose content not match with their extension

Perfect for anyone who wants a lightweight, reliable, and transparent way to declutter their system.

Postal is a complete, open-source mail delivery platform designed for websites and web servers. Think SendGrid, Mailgun, or Postmark — but fully self-hosted and under your control. Key features:

✉️ Full-featured mail server for transactional and bulk email

⚙️ Built-in web interface for managing domains, queues, and logs

🔒 Privacy and security: keep all data on your own servers

🌍 Scalable for small projects or enterprise-level deployments

🧩 Open-source transparency, community-driven development

🚀 Ideal for developers and organizations who want independence from third-party email providers

Perfect for anyone who needs reliable, flexible, and private email delivery without relying on external services.