we are planning to buy a Parallel Studio XE. Our main target is Windows. So we will buy the windows version. Later we are going to port our code to Linux. Will we have to buy another license then or just download a different product but use the same license?
Which IDEs are supported for both OS?
You need to purchase a different license for Linux. It is better to check with the Release Notes for your specific product version to be sure which versions of IDEs are supported. Usually, we do support latest versions of VS on Windows (VS2012, 2013, 2015) and Eclipse IDE on Linux.