Generally, open source refers to a computer program in which the source code is available to the general public for use or modification from its original design. Code is released under the terms of a software license. Depending on the license terms, others may then download, modify, and publish their version (fork) back to the community.
I’m constantly amazed how happy the people I know in open source are willing to help out. I needed some open source people to each record a short interview where I asked them about their motivations for contributing to open source projects, what things in projects might be detractors and, finally, what they see as their reward.
Well, I put out a quick tweet asking if anyone might be able to take part and I had half a dozen volunteers in only a few minutes!