nGENE is completely free of charge no matter for commercial or non-commercial purposes.
However it is not guaranteed that future releases will be free of charge as well.
Here is current license text:
Copyright © 2006-2010 Wojciech Toman
This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:
- The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
- Altered versions must be plainly marked as such, and must not be misrepresented as being the original software.
- This notice may not be removed or altered from any distribution.
License may be subject to any changes without reason.