Bonsai (YC W16): www.hellobonsai. It has time tracking, invoicing, reporting, and more. Founder here and happy to answer any questions!
not exactly time trackig software, but they have made our tasks easy by providing a phone with custom launcher with apps (which includes time tracking software too), websites & content that's important.
https://scalefusion.com/android-kiosk-mode
The downvotes come because the product isn't even remotely relevant to time tracking. And it wasn't in the previous comments where the product was mentioned either.