Found this while browsing around. Intel offer a version of their uber C++ compiler for non-commercial work. Free!
This page provides a download copy of the Intel® C++ Compiler 7.0 for Linux* for non-commercial purposes. The non-commercial license includes access to the Intel self-help support repository, the Compiler User Forums, and issue submission to Intel Premier Support. You will not receive the timely response to support issues through Intel Premier Support that commercial customers receive. In addition, the non-commercial license means the compiler cannot be used to produce products for resale or commercial use.
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