A free program for Android, by PowerOffice AS.

PowerOffice Go is an app that makes life easier for people who manage a company. With PowerOffice Go, you can get access to your pay slip and to register working hours as well as holiday and leave. The app also lets you manage expenses, vouchers, and payments, so you don’t have to write down every receipt and send it in for bookkeeping.

PowerOffice Go is integrated with PowerOffice Go accounting and payroll. This means that billable hours are invoiced easily, hourly and overtime work is included in the salary calculation completely automatically. You can manage the app from your phone and send an invoice directly to your client.