WatchMe is a free (premium available) simple timer program to time a number of different tasks or events together or independently of each other.

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

Rachota is a portable application for timetracking different projects. It runs everywhere. It displays time data in diagram form, creates customized HTML reports or analyses measured data and suggests hints to improve user's time usage.

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!.

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

Invoicera is an online billing software which is specifically designed keeping simplicity and online invoicing convenience in mind, while at the same time offering the best of the breed invoicing features.

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

With timeEdition you can see detailed documentation of your working hours. Be it for a billing of a client, or tracking the efficiency of a project.

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

Coffee is a project management tool that facilitates time tracking with customizable projects, daily limit notifications, a mini timer, data export to CSV, insightful reports, and secure iCloud storage.

Deputy is a simple and innovative workplace management solution for employee scheduling, time and attendance, task management, communication and more.

Never forget what you worked on. Timely tracks everything while you work or play on your computer, or helps you log time on the go. It lets you group activities and provides lots of graphical feedback and reports.