The Dickinson College Commentaries say that they offer “Latin and Greek texts with explanatory notes, vocabulary, and graphic, video and audio elements, for readers of Greek and Latin.” They have all that and more; there is a list of essential vocabulary, clear commentaries, useful notes, and more. This is what an interactive textbook should be.
If you’re looking for wonderful images from the ancient world (or any time period), check out the Heilbrunn Timeline of Art History. You can search on images by time period, area, description, and more. There are alsoEssays on Greek and Roman Art illustrated with objects from the Met collection.
(picture is a partial screenshot of http://www.metmuseum.org/toah/)
If you need to figure out a date among a group of people, like which day is best for Latin club to meet or when it’s best to have a reading group, http://doodle.com/ is a great way to coordinate it.
This is a free online tool that lets you define a range of dates and then lets other people say whether or not that date works. This means everyone can see that, for example, Thursday evening works for nine out of ten people, more than any other date. Also, if you’re trying to schedule shifts to cover something, people can see which shifts need to be covered.