Good Gantt-diagram software?

Question

I have multiple projects on my own, each one with a deadline and a (personal) estimate of the time that I should invest to get the thing done.

At a particular time I can be involved in multiple projects.

What I need is a software that lets me plan and display a "timeline": a line for each project that extends when I've to push efforts into it.

Did you know something that does something similar? I remember that this is a technique used in Software Engineering, but I don't remember the name...

EDIT

Thanks to duffymo, I know that I want a Gantt diagram manager :)

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Answer 1

On the Feeware java-based front, you have GanttProject.

You can launch it from this jnlp link.