1. Tools for Teaching Programming Aid Entry level programming course
Visualize the algorithms
RAPTOR
Rapid Algorithmic Prototyping Tool for Ordered Reasoning
Flow chart Interpreter
Flowgorithm
Graphical Programming tool
RAPTOR:
Flowgorithm:

2. Tools for Teaching Interactive Simulation tool Proteus
Design and simulate electrical / electronic circuits
Provides interactive simulation environment
Evaluation version available

3. Tools for Teaching Interactive Math
Wolfram Alpha
Wolfram Mathematica
Desktop version
Not freeware, trial versions are available
Designed to kindle curiosity in Math