A simple alternative to the STL plus portable multithreading and networking. Compiles under modern Unix and Windows systems. [Open-source, zlib-like license] http://www.melikyan.com/ptypes/
A small application library for writing fast and highly scalable Internet applications on UNIX-like platforms. [Open source, MPL or GPL] http://state-threads.sourceforge.net/
This book teaches the fundamental concepts of multithreaded, parallel and distributed computing. Emphasizes how to solve problems, with correctness the primary concern and performance an important, but secondary, concern. (Gregory R. Andrews) http://www.aw-bc.com/catalog/academic/product/0,1144,0201357526,00.html
A part cross-platform C++ library providing high-performance and portable classes for multi-threading by creating a common wrapper around Windows and POSIX threads, exposing an interface modelled on the popular Java abstractions. Cross-platform support fo http://www.elcel.com/products/opentop/threading.html