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78

answers:

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I'd like develop software which in future I'd like to sell. Qt licence for one user, one OS costs ~2500 euro! I'm student and profit from sold software would be lower than QT Commercial licence cost.

What tools (free or cheaper?) I can use for commercial software developement? (windows and linux, c/c++/c#).

+4  A: 

Both QT and GTK+ can be used for commercial projects and works in Unix and Windows. They are both licensed under LGPL.

The only requirement is that if you modify the library itself (not your own application) you must then make those source code changes available to the user.

Amigable Clark Kant
A: 

A free IDE for C/C++ is Eclipse. Mono has an IDE for C#.

dutt