I have self-hosted https://www.invoiceninja.org/ https://www.invoiceninja.org/ (PHP backend) for years. It is overkill if all you want is time tracking. But i

I have self-hosted https://www.invoiceninja.org/ https://www.invoiceninja.org/ (PHP backend) for years. It is overkill if all you want is time tracking. But it is a good self-hosted solution for project-based time tracking and invoicing.