Gallium Data is free to use for end-users. If you are using Gallium Data in-house and do not resell or redistribute it, you don't owe anything, though you might consider getting a support contract to make sure that any issues are addressed promptly. Contact us for details.
This is not guaranteed to last forever, but the current version is and will remain forever free to use for end users. If Gallium Data starts charging for this software in the future, you will still be able to use the current version at no charge.
Gallium Data can be embedded in other products with a license agreement. Contact us and we'll figure out a deal that can be mutually beneficial.