For some projects, their authors make a living (or at least supplement their living) by providing documentation, source code examples, consulting etc. that center around their software. JFreeChart and JasperReports follow this model. In a different vein, iText switched to a license that generally requires businesses that use it to buy a license.
Devaka Cooray wrote:Open source are not meant to earn money from them. People who contribute in open source do so with the prime interest they have in open source, and not as a way of making money.
I wouldn't say that in this generality, neither the first nor the second part. It often works this way, but one can't make assumptions about person X working on project Y. And, of course, many do it to enhance their professional stature, because it looks good on their resume. In that way the project would very much be meant to make money :-)