The Fourth Industrial Revolution (4IR) has highlighted the need to digitise the manufacturing environment. In line with this, the CSIR is developing a low-cost Manufacturing Execution System (MES) based on open-source software, intended to support SMME's in South Africa. It leverages Node-RED for the core of the system, supported by other open-source software such as InfluxDB, MongoDB, and Tasmota. The development of this system is guided by the international standards and definitions presented by the Manufacturing Enterprise Solutions Association (MESA). The developed MES solution provides several functions such as product creation, machine monitoring, and dash-boarding to name a few, and proves that an MES solution can be created using open-source software.