Beware of Easy Invoice on OSX. Scary stuff.

I've used Easy Books on OSX for the last two years to send quotes, invoices and track payments as a contractor. It's simple and it works flawlessly.

Today, like any other Friday, I open the app to send a sales invoice. To my horror the app displays a modal dialog saying "Firstly, don't worry - your data is still stored on this Mac." - then it insists I register a free trial account for their online backup service. No register, no access to accounting data.

The is absolutely the worst thing I've ever seen. I understand their need to monetise, but locking me out of my data until I've given them something they want is simply wrong.

How would you feel? For me, I feel absolutely stupid for using free, proprietary software for my accounts. I've never seen anything like this in my years in software.

Does anyone have a suggestion for a good open source accounting package that handles quotes, sales invoices and payment tracking?