Plugins
Download aviable Plugins Jar File Calendar_J.jar (153 KB) and add to ImageJ2x/plugins directory.

Download aviable Plugins Jar File command_bar.jar (192 KB) and add to x/plugins directory.
Download aviable Plugins Jar File mat_commands_bar.jar (52 KB) and add to x/plugins directory.

Tools
Download API File JCalendar.zip (473 KB)