Tiki-Toki: This is a web-based timeline creator that allows you to create interactive timelines with multimedia content such as 

images, videos, and audio. It offers a free basic plan with limited features, but you can upgrade to the paid version for more advanced features.

TimeToast: This is another web-based timeline creator that allows you to create timelines with text and images. 

It has a simple interface and is easy to use. The basic plan is free, but you can upgrade to the premium plan for more features.

Timeline JS: This is a free, open-source tool that allows you to create interactive timelines using Google Sheets.

 It supports multimedia content such as images, videos, and maps.

Knight Lab: This is a suite of free tools created by Northwestern University's Knight Lab that includes 

Timeline JS (mentioned above), as well as other tools for data visualization, storytelling, and more.

All of these options allow you to create engaging timelines to help visualize historical events and their relationships to one another.

Time.Graphics: Time.Graphics is a free timeline maker that allows you to create timelines with a range of customization options. You can choose from a variety of templates or create your own, and add images, videos, and links to your timeline.

Preceden: Preceden is a free, online timeline maker that allows you to create interactive timelines with ease. You can add events, dates, and descriptions to your timeline, and customize it with your own colors and fonts.