The Divi Timeline Module allows you to add timelines to your Divi site. Add either of the modules included and either add each timeline item, content, read more link then style it OR select where the items should come from (ie, posts, pages, portfolio items!).
View the review of the Divi Timeline plugin on Elegant Themes blog.
This works responsively also. The alternating item layout in the screenshots works when in 1 column mode and in 1/4, 1/3, 1/2 etc the timeline bar is offset to the left (see screenshots). Each timeline item can have it’s own icon, colour, content and/or read more link so you can showcase your content as you see fit. You can also use Advanced Design Settings within the module to change fonts, colours, padding etc.