There are various software related to the implementation of IT Service Management (ITSM) for a company, including those that are open source and commercial. An input is needed for companies in determining what software to choose from various software, especially for small and medium enterprises (SMEs) that have limited human and financial resources. In this study, we have contributed in evaluating open source ITSM software (including OTRS, ITOP, and SDP) that are suitable for use by small and medium-sized companies. In the evaluation process, we evaluated various appropriate criteria, so that we finally chose the quick-win criteria from ITIL V3 (one of the best practices that are widely used in ITSM). The method used for training is Fuzzy SIR (Superiority and Inferiority Ranking) with assessment criteria for data taken in the form of quantitative data from experts who have used and had certificates in the field of ITSM. The results showed that OTRS was the best software with a value of 0.86, SDP was in second place with a value of 0.77, and ITOP was in the last place with a value of 0.04.