STLport
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STLport is a multiplatform C++ Standard Library implementation. It is a free, open-source product, featuring the following:

STLport works on any platform possible and proves itself as a seamless drop-in for modern production environments. Not only that---it also offers important functionality not provided by any other standard library vendor:

With STLport, you rely on uniform solid code base for all compilers used in the project. Started as a one-person effort in 1997, it has now become, with the help of numerous contributors, an excellent choice for multiplatform projects.

There are absolutely no restrictions on STLport use in commercial projects, and no royalties are involved. There is no GPL. Please read your free license for details.