Kimai is a web-based multi-user time-tracking application
...Every user can configure the data columns that should be shown, e.g. to prevent horizontal scrolling on small devices. Kimai was built to be extendable, and features can be added with plugins. Developers wanting to create them can use many extension points.
A ready-to-use CodeIgniter skeleton with tons of new features
Plugins system where you can install, upload, activate, deactivate and delete plugins, just like WordPress, Joomla! and others. Modules management where you can as well install, activate, deactivate and delete modules. An application-free and ready-to-use dashboard. Multiple application contexts: ajax, process, content, help, reports and settings.