SimPHY : The Physics Simulator
This program lets you visualize Rigid body Physics , create free body Diagram, analyse Constraints, and create simulations based on rigid body 2D Physics.
It also allows user to save and export simulations. It is created to make understanding of physics better.
for more info please visit www.shikharedusoft.com
Author
Mahesh Kurmi
Credits
Willium Bittle:  For his awesome dyn4j library, from which my physics engine is derived.
jogamp:  For jogl library, used for opengl rendering of scene.
apache:  For ftp library
Ayman Al-Sairafi:  For syntaxpane library used in script editor
Big thanks to all those who share their knowledge and experience openly on internet world and supported me directly or indirectly.