Tutorials
This would be software that covers an entire instructional sequence on a topic. The students will need to be able to learn the material without assistance or other materials. Tutorials are generally for learners that can read well and are often older students or adults.
This is a great web site that allows students to explore various early American topics. This is a must bookmark page for US History teachers.
This is a great source for tutorial information and instruction in various aspects of US Geography.