Apps to Sits in the System Tray

ActivityWatch is a free and open-source, privacy-focused time-tracking application that automatically monitors how you spend time on your devices, offering detailed insights into your digital activities with local storage and offline functionality.

Kontact - KTimeTracker is a user-friendly time tracking tool designed for seamless integration within the Kontact suite. It allows individuals and teams to log time spent on various tasks and projects, aiding in productivity monitoring and reporting.

Sidebar Diagnostics is a lightweight, customizable sidebar for Windows that provides real-time monitoring of your system's hardware, including CPU temperature, memory usage, fan speeds, and more. It's designed to be unobtrusive while keeping essential performance data readily available.

Performance Maintainer is an open-source utility suite designed to optimize and enhance your PC's performance. It offers a comprehensive set of tools for cleaning the registry, freeing up disk space, defragmenting drives, and managing installed software to ensure your system runs smoothly and efficiently.

Feed Notifier is a lightweight desktop application for Windows and macOS that resides in your system tray or status bar, providing unobtrusive pop-up notifications for new items in your RSS and Atom feeds. Stay updated on your favorite websites and blogs without constantly refreshing.

WindowsPager is a lightweight and portable virtual desktop manager for Windows, allowing users to organize applications across multiple workspaces to enhance productivity and reduce clutter on their screen.

Radio Tray is a lightweight and unobtrusive online radio streaming application designed specifically for Linux users. It resides conveniently in the system tray, providing quick access to your favorite internet radio stations without cluttering your desktop. It supports a variety of stream formats and is built with simplicity and efficiency in mind.

Project Hamster is a personal time tracking application designed to help individuals monitor and manage how they spend their time across various activities. It resides conveniently in the system tray, offering a non-intrusive way to log activities and gain insights into daily time allocation.

Quod Libet is a highly extensible GTK+-based audio player for Linux, focusing on powerful music library management and flexible tagging. Written in Python and using the Mutagen library, it offers extensive customization and handles diverse audio formats seamlessly.