Toggl Track is a time-tracking software that works across various environments and devices, providing detailed data on profitability and productivity. It features one-click and background tracking, and can be integrated into your workflow.

ManicTime automatically records your computer usage. It remembers which apps you've used and for how long. It will also remember which web sites you've visited and which documents you've worked on.

This tool automatically monitors computer use, providing detailed insights to enhance productivity and time management. It features goal setting and alerts to help conquer procrastination, while comparing user metrics to average data for broader context.

Clockify is a full-featured time tracking tool for teams. It comes with advanced time tracking features and unlimited team members.

Cattr is a free open-source self-hosted time tracker with desktop clients for windows, mac, linux. The key features are built-in screenshot capture, activity detection. Integrations with jira, redmine, trello, gitlab, other task managers via plugins.

Paymo is a work management software for small businesses. It allows you to manage projects and business tasks, track work time, and invoice clients from one place.

Web-based, desktop, & mobile software for time tracking and leave management optimized for freelancers & SMEs. Includes a smart timer, gamification, leave management, time reports, invoices, user roles, and other helpful tools.

Invoice Ninja is a free, open-source solution for invoicing and billing customers. With Invoice Ninja, you can easily build and send beautiful invoices from any device that has access to the web.

Real-time automatic time tracking tool that categorizes applications as productive, unproductive, or neutral, runs unnoticed without user input, and boosts productivity while enhancing transparency and accountability in an empowering work environment.

WorkTime is an employee, computer and internet monitoring software. It monitors productivity and helps boosting it. It monitors working-from-home, remote, and in-office employees. WorkTime does not support any invasive monitoring.

Comprehensive cloud accounting for small businesses and freelancers; save time billing clients by sending, tracking, and collecting payments swiftly. Generate professional invoices, manage expenses effortlessly, track project time seamlessly, and prepare for tax with ease.

Analytics for programmers using open-source text editor plugins. The service itself is not open source, only the plugins.