David Wheeler has been keeping a comprehensive list of quantitative data on using open source software / free software as a reasonable or even superior approach to using their proprietary competition. A snippet of the conclusions: OSS/FS has significant market share in many markets, is often the most reliable software, and in many cases has the best performance. OSS/FS scales, both in problem size and project si David Wheeler has been keeping a comprehensive list of quantitative data on using open source software / free software as a reasonable or even superior approach to using their proprietary competition.A snippet of the conclusions: OSS/FS has significant market share in many markets, is often the most reliable software, and in many cases has the best performance. OSS/FS scales, both in problem size and project size. OSS/FS software often has far better security, perhaps due to the possibility of worldwide review. Total cost of ownership for OSS/FS is often far less than proprietary software, especially as the number of platforms increases. These statements are not merely opinions; these effects can be shown quantitatively, using a wide variety of measures. This doesn’t even consider other issues that are hard to measure, such as freedom from control by a single source, freedom from licensing management (with its accompanying risk of audit and litigation), Organizations can transition to OSS/FS in part or in stages, which for many is a far more practical transition approach. Open Source