lxml is a Python binding for the libxml2 and libxslt XML processing libraries. It aims at ease of use of the API for Python programmers and exposing the many libxml2 features. It implements the Python ElementTree API on top of libxml2. It extends this with support for XPath, XSLT, Relax NG, XML schema, and more.
mGSTEP is a software development framework designed primarily for use in embedded devices. It implements the core elements of NeXT's OpenStep that evolved into Apple's Cocoa Objective-C class libraries. The drawing API is a partial implementation of Display Postscript in parallel with the newer Core Graphics API. The stable GUI (AppKit) is X11 based. A Linux framebuffer based GUI backend is also included.
MacSTL is a C++ source library which offers an implementation of std::valarray which is optimized for the SIMD instructions on PowerPC and Pentium processors. It runs from 3.6 to 16.2 times faster than hand-coded scalar loops. It also wraps the SIMD data types in an object-oriented package, allowing programmers to use familiar infix notation (e.g. v0 = v1 + v2).