My country is going through difficult times. I want to create a mostly graphical timeline of events in a wiki like fashion. I want everyone who wants to get involved to contribute and comment. What is my best option?
Timeglider is a free web-based application that allows you to create timelines with the option to collaborate (though I don't know that it's as open as a wiki, per se). Dipity is another similar application with collaboration as an option.
StudyVibe also has a listing of several Timeline Creation Tools.
I think proofhub is a free web based application that can help you. It has features like time tracking, assigning a task to multiple users, to-do's, discussions and many more. I hope you will like this tool and find it useful for your work.