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.

Track time on projects, analyze productivity with detailed reports, manage tasks, and collaborate across web, desktop, and mobile with real-time sync.

Manage projects, track billable hours with live timers, invoice clients, collaborate in real time, and gain insights into profitability and team workload.

Timemator for Mac lets you automate your time-tracking and forget about the timer. Forever! Just tell Timemator what files, applications or websites you use for your work and it will start the timer for you. Automatically!

TimeCamp is a time tracking software for freelancers and companies. It's well equipped: budgeting, invoicing, project costs and many others. If you're looking for a mobile-friendly solution, this one will be perfect!.

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.

Grindstone is a desktop application, produced by Epiforge Software, that allows users to create and organize tasks and to track time. It includes a range of other features that supplement this primary functionality.

EasyOrg is a Task Management and Personal Project Management app. Your data is store in regular text files in Emacs org-mode format. You can write your tasks and notes in an editor or by using a graphical user interface.

Automatic time and productivity tracking app for Mac. Lets you track hours, improve productivity, and bill clients.

timeBuzzer is a simple time tracking tool for freelancers, agencies, and project-driven teams.

Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing.

Deputy improves employee scheduling and communication with shift planning, task management, notifications, and deep integration capabilities.

STARC, an automated timesheets recording tool for employers to identify, track utilization & productivity of employees. Strictly NO manual intervention!!!.

Timewarrior is a command line time tracking application, which allows you to record time spent on activities. You may be tracking your time for curiosity, or because your work requires it. At its simplest, you tell it to start and stop tracking time.

Buddy Punch is a web-based time tracking and workforce management system that helps businesses manage employee timekeeping, scheduling, and payroll. Key features include automatic overtime calculations, GPS tracking, geofencing, time card approvals, paid time off tracking, and...

The Online Invoices innovative system enables you to invoice clients fast - track and receive payments online in seconds. Use built-in powerful features to manage subscriptions.

Timeframe helps you maximize your productivity by not just simply tracking your time, but providing insights and tools to help you to reach your goals. The app is designed to help you stay focused and motivated throughout the day. It has a beautiful interface that makes it easy to use.

Time tracking and scheduling app for field service and mobile teams, with GPS and Mileage tracking.

ClockShark is a mobile time tracking and scheduling app for construction contractors. It uses mobile apps that act as time clocks for your employees, and a web-based dashboard where you can review times worked and set employee schedules.

Mac time tracking automation: freelance project tracking, timesheets, invoicing & productivity feedback

Accurate employee time tracking software for reporting, invoicing and payroll.

Kapow is a punch clock program designed to easily keep track of your hours, whether you're working on one project or many. Simply clock in and out with the Start/Stop button. If you make a mistake in your hours, you can go back and edit any of the entries by double-clicking...

Keep track of your time like never before by using Klok’s familiar calendar-like display. And at only $19.99 USD how much lost time does it have to save to make up for its cost? Still not sure, download the free version by clicking “Install Now” below.

HourGuard makes it easy to track work hours with its simple-to-use interface. Click Start when you begin work, and Stop when you finish—the time tracking software does the rest for you, generating time sheets and even creating invoices for you.

PTM is an Open Source time tracking tool hosted by Sourceforge.net.

It looks like Windows Task Manager (see screenshots)

Have you ever suffer to answer to questions like...

What have you done last week?,

On what kind of things did you spent the time?

humm... I used to have.