Comeau C/C++
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Comeau C/C++ is a C and C++ compiler released by Comeau Computing.
Comeau C/C++ is known for having excellent support of the C and C++ standard. It's also one of the few C++ compilers to fully support the export keyword for exported templates[1].
As opposed to most other compilers and similarly to Cfront, Comeau C++ does not include any target machine code generator, but produces an intermediate C code and relies on an already installed C compiler for target code generation[2]. Because of this it can be used with exotic systems, for which no native C++ compilers are available.
Comeau C/C++ is not freeware, but it's possible to test compilation of code snippets online.