A Wiki dedicated to timelines. It visualizes historic matters graphically on a timescale. WikiTimeScale is open source and its created images can be used as wished (e.g. for presentations). (Go to its project homepage: http://www.wikitimescale.org)
Geovision is a system for collaboratively maintaining and viewing geographical data, especially data over time. Other types of historical data and its visualization also lie in the project's future.
To develop a software package for time series manipulation and cycles analysis. Cycles means repeated occurrences at nearly equal time intervals in any time series data. See http://www.cyclesresearchinstitute.org/ for a site about cycles.
timeline is a script that generates a graphic historic timeline in some formats (html, ps, text, png, etc...) based on a source file. You will need Ruby (http://www.ruby-lang.org) to run this software.