provides direct links to over 7000 scholarly periodicals which allow some or all of their online content to be viewed by ANYONE with Internet access for free
a unified interface to a number of different physics engines. Enables the use of multiple physics engines within one application. Not just a simple physics wrapper, it provides an extensible plug-in architecture as extended functionality for common simula
physics engine written primarily for games. As the name suggests, Box2D is a purely 2D engine. However, Box2D has grown beyond it's humble box simulating roots, and can now handle convex polygons and other shapes coming soon.
Another physics library, this one is patrocinated by Intel, so it is free to use even on commercial games, provided you just put their logo and a tell them what you are doing ;)