AtTrack - First modular time tracker to improve team's productivity

Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.

Tickkl - Tickkl is a time tracking software that focuses on automation, forecasts, powerful reports and extreme simplicity of the user interface.It also plants trees on behalf of you or your organisation if the GREEN plan is active 🌱.

Clockify - Simple and free time tracker. Perfect for small and mid-sized businesses as well as freelancers. Unlimited projects and users, unlimited productivity. Get all the premium functionalities, completely free.

Assista.io - Assista will improve your productivity, track your team’s progress, and give you detailed information about your work.

Cattr - Cattr is a free open-source self-hosted time tracker with desktop clients for windows, mac, linux.