Dev Tip – Suggested Windows Phone 7 Developer Tools and Resources

http://axiom3d.net/wiki/index.php/Main_Page

Open source 3D engine using C# and the .NET framework. Provides full support for DirectX, OpenGL and XNA on Windows, Linux, Android, iPhone and Windows Phone.

http://visualstudiogallery.msdn.microsoft.com/eb5ec31a-9e37-4f44-8308-1314026d96d3

Axiom 3D Game templates to help you get started

http://xbox.create.msdn.com/en-US/education/catalog/sample/game_state_management

A simple screen manager template done by Microsoft themselves. Perfect starting point for any Windows Phone project.

http://visualstudiogallery.msdn.microsoft.com/f9645de3-2050-4e4f-b2c8-61928c3ec636

This is a basic physics tutorial. Involves gravity, collision detection as well as using the accelerometer in the device.

http://visualstudiogallery.msdn.microsoft.com/e69b3fe4-0b13-4eeb-8bfe-ab2f964b011c

Tutorial for utilizing hold, drag, tap, flick, and pinch gestures for Windows Phone

http://xbox.create.msdn.com/en-US/education/catalog/?contenttype=0&devarea=11&platform=54&sort=1

Tile based RPG tutorial. Useful for tile based designs, basic AI, collision and exposing XML files

http://msdn.microsoft.com/en-us/library/hh184843%28v=VS.92%29.aspx

Windows Phone app store submission guidelines

http://msdn.microsoft.com/en-us/WindowsPhoneTrainingCourse

Windows Phone Training Course

http://farseerphysics.codeplex.com/

An extended version of the Box2D.XNA port. Fully featured physics engine for use on WP7 projects.

Source: http://canadianopendataexperience.com/pages/coding-resources