FAAST is an open-source C++ library providing strongly object-oriented data structures and high-performance algorithms for elements and polynomials in Artin-Schreier towers over finite fields.
FAAST is maintained by Luca De Feo.
You can download the latest version or browse through the other releases. See the ChangeLog.
You can browse the documentation as a multi-page html manual or download it as a gzipped archive.