Preceden (means "precede" in Spanish according to the developers) is an online web-based timeline and simple time-schedule tool.
The whole point with Preceden as opposed to other solutions for creating timelines is the flexibility. For example creating a timeline in any spreadsheet program, such as Excel, is usually torture, even-though there are built in templates, especially when more detailed timelines are required.
In Preceden different parts of a timeline can be grouped together in layers, the parts of the overall timeline have different colors and it's also possible to name the layers and dragging the elements around. It's also possible to add an event without an end-date, and select zoom-levels (seconds, hours, years etc). Overall the user-interface is very straight-forward and easy to use.
Since Preceden is cloud-based it means that it's possible to share timelines with the rest of the user community. It's also possible to share a timeline requiring a password, or share a more restricted version of a timeline where a predefined URL is shared to selected participants. Unfortunately Preceden currently lacks more advanced collaboration options. In Google Docs and other applications it's for example possible to invite selected users to create and edit a document.
It's also possible in Preceden to download a timeline as an image or a PDF-file (which is printable). In the trial free version of Preceden it's only possible to create five timeline events, which makes it pretty much useless. The pro-version has a one-time fee of $39, which is pretty cheap (depending on what type of timeline you are creating). Preceden has no login-integration with social media such as Facebook, so you have to create a sole login for the service, which in our minds leave room for improvement.