Sultan is a simple minimarket POS software with GPL license. It is designed to be able to run on minimal hardware especially for Raspberry Pi. Sultan is written in C++ and using Qt framework.
Why Sultan is made? It is because there is no free POS software that really can be used for real shops that able to run on Linux. Most of the software out there is only work on Windows. Here in Indonesia, a lot of minimarket does not have system and some of them still using DOS and Windows OS on their system. Using Linux and Raspberry Pi will be cut the a lot of cost.