The 0.9 version of Kimai for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. Kimai for Mac is included in Business Tools.
From the developer:
Kimai is free and open source. Kimai is software that tracks work time, and classifies it. It tracks time and prints out a summary of your activities on demand. Yearly, monthly, daily, by customer, by project, by action.
Its simplicity is its strength. Due to Kimai's Web browser based interface it runs cross-platform. Also it runs cross-network. Likewise you can install it as a Web service or as a single-user program on your local workstation.