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Open source becomes ubiquitous in the software world. Eighty percent of software is claimed to be developed using open source approach. Open source technologies dominate such domains as cloud, content management, security, mobile, social media, etc. In this article we review the history of open source software (OSS) development, the research on OSS, and the impact that OSS has on technologies, industry, and society. We conclude with the evolution trend that we picture of the future OSS ecosystem.