Open Source Point of Sale is a web based point of sale system written in the PHP language. It uses MySQL as the data storage back-end and has a simple user interface.
Installation is made easy thanks to a step-by-step guide at opensourceposguide
Most recent versions will be available on jekkos' github repository, while stable releases will be ready for download on this site as well.
If you like the project, and you are making money out of it on a daily basis, then consider to buy me a coffee so I can keep adding features.
Or send some coins to 19kwPpAwrUTxbNEs5D6cRR1k4mf5HNa4v2