Qbserve!

Understand exactly how you spend your time and attention, with no data entry.

Track your computer usage and use collected data to accurately tag time. Auto tracking of computer usage (8 languages), during a day average user can switch back and forth between applications more than a 1000 times, which means ManicTime gathers a lot of data. Local storage, powerful statistics: see which applications you use the most or on which web sites you spend the most time. Also easily figure out how much time you spent working on projects to accurately bill your clients or just keep track of your work. »

InvoicePlane is a self-hosted open source application for managing your quotes, invoices, clients and payments. The application comes with various options, templates and settings to customize your invoicing experience.

Project Hamster is time tracking for individuals. It helps you to keep track on how much time you have spent during the day on activities you choose to track.

Paymo is an online project management application that helps you deliver projects on time and on budget by eliminating bottlenecks through accurate time tracking & reporting.Paymo can help you with task management & collaboration, time tracking, invoicing, estimates & expenses.

Analytics for programmers using open-source text editor plugins.

HTML5 time tracking web app focused on speed and simplicity that encourages you to follow the Pomodoro Technique.

LeechBlock is a simple free productivity tool designed to block those time-wasting sites that can suck the life out of your working day.

Kimai is a free open source timetracker. It tracks work time and prints out a summary of your activities on demand. Yearly, monthly, daily, by customer, by project, by action …