"The premise of DM is simple: if you have a collection of digital images and texts, then you should be able to develop a project where you can identify specific moments on these images and texts, annotate them as much as you want, link them together, generate searchable content, collaborate with your friends, and publish your work online for others to see and share.
DM was developed on the Heroku cloud-server platform, where installation and administration is straightforward,
after which developing individual projects requires no specific IT expertise." -From the website description.