Here are some screenshots of the simulator in action

 

Features:

RB Cutting Back
RB lane searching
RB juking
RB priority threat identification
LB containment pursuit
LB maximal pursuit
LB block avoid
Blocking
Player stats editing
Play editing
Highly editable AI
Accurate physics environment

Future features:

Quarter Back AI
Recieving AI
Coverage AI
Play calling AI
AI extention API (via proprietary script language or python)
Java 3d Graphics

Requirements:

Windows 9x w/ Java Run Time Environment v2

A healthy dose of football enthusiasm

You can download Grid Iron Physics 1.2 from here