On the market there is number of Mockup tools. All of them are providing similar functionality. Some allow import external graphics or exporting to pdf files out of the box. But for my needs all those additional features are not necessary. The most important factor is that the tool should provide standard mock-up functionality and by relatively cheap or freeware ;). That's why I was looking for tool that will meet that criteria:
- standard functionality
- relatively cheap/freeware
After some research I found great tool ! It's called Evolus Pencil. It is distributed on GNU license ;) and provides all the functionality I need.
The authors of the project are open for new contributors that will help in developing this great tool. So if you are an open-source developer and want to participate simply contact them ;)