Who knows, a free program for the store?

Question

Programming

Let me know if anyone knows or who works. You need a free program for accounting in the store, you need it to be able to:
-Add goods, assign a unique article, the ability to add a serial number, set the purchase price and add a margin
-The function of selling goods - mark which goods and in what quantity were sold, show "net" profit from the goods
-Print price tags
-Export data to Excel.

Answer 1

maybe someone knows

An alternative solution for a store and a restaurant along...
And there is something else in the forum section.

Answer 2

Prestashop with 1C integration module.