Evernote is a popular tool that allows people to create, edit and share notebooks with text, audio, video and other media. I've been using it for a while now and was surprised to find that I hadn't posted about it, so here we are. The fact that it can be accessed with any mobile device makes it a great way to keep things up-to-date. Although I don't use it with learners (yet!), I have found it invaluable as an alternative to Post-it Notes and a great way to organise bookmarks, digital media and other resources from around the web. Have a look at how teachers make use of it here. Fortunately, the helpful team at Evernote has also provided these resources so you can fully explore the applications of Evernote in the classroom.
Trello is another helpful tool that allows a group to organise the various elements of projects by assigning different responsibilities to individuals and then allowing them to update their progress in real time. This video gives a general (not very education orientated) introduction to the functionality but it's easy to see how it can be used for groups to collaborate, perhaps even providing a more modern take on Gantt charts?