The Amanith Framework is a cross-platform (Linux, Win32, MacOS X, FreeBSD and IRIX) open source C++ library for vector graphics. The new 0.3 release adds a full SVG 1.2-compliant enhanced alpha compositing layer, supporting all 24 compositing operations (base and extended Porter-Duff) in pure OpenGL. This makes Amanith the first opensource and crossplatform library that supports all of them in hardware (15 of 24 are available also without fragment programs). In addition a full geometry caching system has been introduced to speed up all drawing tasks.
Matteo - www.amanith.org