Do you know of any good historical timeline software?

Timelines are useful for studying history. I figure there must be some good software for displaying them, which would allow various types of filtering. There should be an ability to filter by level of detail, with some events given higher priority than others, with the ability to edit if you disagree. You should be able to filter by time period and location, and also by type of event, like military, art or science. There should also be the ability to display multiple parallel timelines.

I did a Web search but did not find much that looked promising.