 Distributed under GNU General Public License (GPL), HOSxP is free software in HOSxP-PCU (HOSxP Version for Primary Health Care Unit) and yearly subscription in HOSxP & HOSxP XE (HOSxP Version 4).The development started in 1999.Emerged from a solo project by Chaiyaporn Suratemekul, a pharmacist by training, now main developers of the software are staffs from Bangkok Medical Software Co., Ltd., a company led by Chaiyaporn.