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Commercial toolsets
Caution: commercial doesn't mean proprietary!
Vendors play fair with the GPL and do make their source code available to their users, and most of the time, to the community.
- As long as they distribute the sources to their users, the GPL doesn't require vendors to share their sources with any third party.
No issue with all the GPL sources developed by or with the community.
Graphical toolkits developed by the vendors look proprietary. Their licenses are not advertised on their websites! You have to be a customer to know or get a free preview kit to know.