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The present paper determines the use of Open Source Software (OSS) in building Indian Institutional Repositories. The paper further covers the use of different OSS, use of OSS in different types of institutions, Indian States / UTs and different disciplines. The data were collected from Open DOAR, ROAR, AGRIS and LIS link Kerala. A total of 209 Open Access Repositories were identified. The outcomes of the study reveal that Dspace and Eprints are the most used OSS in Indian Institutional Repositories; the institutions of Karnataka, New Delhi and Maharashtra State / UTs have used a good number of OSS in developing the Institutional Digital Repositories (IDRs) and the subject discipline like Science, Technology, Health and Medicine were intensely used OSS to develop the IDRs.