<p>Are there LaTeX packages for (more or less) easily drawing Gantt diagrams?</p>

<p>Thanks.</p>

I have not used myself, but it looks like PSTricks offers some Gantt chart drawing capabilities.
Main PSTricks site:
http://tug.org/PSTricks/main.cgi
Example of Gantt chart using PSTricks:
http://tug.org/PSTricks/main.cgi?file=Examples/Charts/gantt