Ok. I have started to port an open source project from Linux to Windows. My doubt is, can i sell it for money after porting to windows? is it ethical?
IANAL. Most open source projects use one of the "standard" licenses:
In many open source projects there is a COPYING/LICENSE file which includes the license. Find out what license your project has. These keywords should be enough to get you started.
In many of these cases the license may require you to attribute the original author.
If the project does not explicitly state the license type, the author (copyright holder) has not granted you any right to use it in derived work. You must seek his explicit consent before using it in a commercial project. There is a slight possibility that your open source project uses a "custom" license that is not included above, in which case you need to read it in details.
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