I think not having an English version of the product site hurts. I know it is unfair criticism but it does add friction. Also it is not immediately clear what license the code is under. Maybe a License.txt?
Google translate of the home page has this:
SambaPOS free to download and can be used without any restrictions, and Touch Screen-assisted Restaurant Program Open Source project. I use the program as you wish, may make changes to the source code and share it with our community.