The Micro C++ Library (libmicxx) is a small set of portable and easy to use classes providing core features commonly used in modern applications. It is based completely on the Standard C++ Template Library (STL).
The NXS Toolkit is a set of individual modules written in C99 to add some additional features missing from the language, including exception handling, interchangable file and memory I/O, and threading. Modules can be used alone or built into a library.