Here is a quick overview of the features offered by WorkTracker:
You can switch the project you are currently working on with a single click.
Local Data Storage
All data is stored in a local database. No data will be transmitted anywhere unless you explicitly tell the application to do it (in the future).
Comprehensive Time Log
WorkTracker does not just count your time, but creates actual log entries every time you switch between projects. This allows you to review your daily work in as much detail as you wish. (A full-featured log browser will be in the next release.)
Standalone Java Application
Runs on any platform that has a Java 8 runtime and does not need any installation procedure. You can in theory carry your application around on a USB stick and use it anywhere.
Here are some screenshots to convince you of the simplicity:
Adding a Project
WorkTracker is distributed under the MIT License and thus you may download and use it for free!
Find the latest version on the GitHub release page, download the correct file for your operating system and unzip it to where you want the application to live and store its data.
Here you can report any bugs, if you find any. Also, feel free to submit ideas for improvements and new features.
If you want to anything else with it or the source code, be my guest. Note, however, that I am in no way (legally) obliged to provide support or responsible for any problems you might encounter.