styles There are great styles built right into opentip and it’s easy to create your own.
ajax Opentips can automatically download their contents via AJAX. It’s extremely easy to configure them to do so.
joints&targets Joints and targets allow you to position the tooltip exactly where you want it.
stems Stems are those little pointers. You can configure them to point in any direction.
canvas Opentips are drawn on canvas which creates beautifully rendered tooltips in all browsers.
many more… There are many more features! Dive into the documentation to get more information.