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What was your gateway product to open source?
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If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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For me it was Python and C development on Linux. (So Anaconda.) I was pretty impressed by how much you can do with free software. Before I would have thought scientists would use expensive proprietary software for calculations. Later I learned that they sometimes still do, but many write their own code using work from others in the field who released open source software.