Although there have been a number of studies on large scale implementation of proprietary enterprise information systems (EIS), open-source software (OSS) for EIS has received limited attention in spite of its potential as a disruptive innovation. Cost saving is the main driver for adopting OSS among the other possible benefits including security and reliability, transparency of development process, etc. Due to the costly implementation of proprietary EIS, small- and medium-sized organizations have given attention to OSS as an alternative. OSS EIS can also help create competitive advantage by enabling organizations to customize their information systems by modifying the opensource software codes without the dependency on vendors.