Xtimeline.com- Create interactive timelines for free!
link
This is a free service that lets users create timelines online, and has plenty of timelines available for searching on a number of topics and time periods. When you create your timeline, you can choose whether or not to share it with the general public, and with whom to share editing.
The service is loading very slowly for me at the moment. Hopefully the issue will be corrected soon.
