Upcount is free to use and is available for Mac and Linux.
Windows version is coming soon!
"Cats will outsmart dogs every time."
Upcount is a beautifully-simple desktop app designed to help manage your invoicing. Easily keep track of invoice payments, overdue invoices via invoice states.
Track time spent on projects and automatically convert to invoices.
Easy to understand and use invoice creation interface.
What you see is what you get.
Customize the invoices according to your needs and preferences.