I built a time tracking app and control panel for ourselves at our company out of frustration (it was very basic, for compliance with spanish law) and eventually we just fixed so much stuff and added so many features that we just released it as a product https://workstamp.eu

We need to reduce the entry barrier (it's meant for companies so it needs explicit registration) so anyone can use it as a proper SaaS but so far we already have a couple clients :D