Features:	Training Center	W3 Schools	A Tutor	Web Teacher	Sun Java	Project Cool
Interface:
Linear Navigation 1	Yes	Yes	Yes	Yes	Yes	Yes
Interconnected Navigation 2	Yes	No	Yes	Yes	No	No
Clutter-Free Interface	Yes	No	No	No	Yes	Yes
Index / Searching	Yes	Yes	No	No	Yes	Yes
Separate Windows	Yes	Yes	No	No	No	Yes
Web-Based	Yes	Yes	Yes	Yes	Yes	Yes
Accounts:
Anonymous Login	No	No	Yes	No	No	Yes
Teacher/Admin Accounts	Yes	No	Yes	No	No	No
Saves Progress	Yes	No	Yes	No	No	No
Personal Preferences	Yes	No	Yes	No	No	No
Personal History Tracking	Yes	No	Yes	No	No	No
Quizzes:
Provides Quiz & Evaluation	Yes	Yes	Yes	No	Yes	No
Questions Embedded Throughout	Yes	No	No	No	No	No
Proficiency Pre-test 3	Yes	No	No	No	No	No
Add-Ons:
Interactive Examples	Yes	Yes	No	Yes	No	Yes
Tutorial Creation	No	No	Yes	No	No	No
Printing	Yes	Yes	Yes	Yes	Yes	Yes
Chat Room	No	No	Yes 4	No	No	No
Message Board	No	No	Yes	No	No	Yes
Open-Source	No	No	Yes	No	No	No
Remote Desktop	No	No	No	No	No	No
Tutorial Rating 5	No	No	No	No	No	Yes
Administrator Statistics Tracking	No	No	Yes	No	No	No

NOTES:

¹ Provides Next / Previous navigation between tutorial steps.

² Supports links between tutorial sections / back to index / etc.

³ Allows user to "test out" of a tutorial if he/she demonstrates proficiency.

⁴ Version 1.4.2 and later with plugin.

⁵ Allows user to give evaluative feedback on tutorials.