FORMAT
http://www.readwritethink.org/files/resources/interactives/timeline_2/
Website based program developed by National Council of Teachers of English.
Also available as an iPad, iPhone and Android app.  Free.      
DESCRIPTION
"Timeline allows students to create a graphical representation of an event or process by displaying items sequentially along a line. Timelines can be organized by time of day, date, or event, and the tool allows users to create a label with short or long descriptive text. Adding an image for each label makes a timeline more visually appealing."  from ReadWriteThink