I've started using a very nice native Gantt chart creation tool that runs well on x86 Solaris. The tool is Planner and I got it from blastwave.org, a good site for getting x86 Solaris binaries.
My major complaints about this tool are:
\* it doesn't generate PERT charts
\* when you export HTML, the x-axis of the Gantt chart lacks date labels
\* in the program view of the Gantt chart, the x-axis is labeled with "week 1", "week 2", etc., rather than actual dates
\* the PDFs it exports are viewable by Gnome PDF reader, but Acrobat reader shows many "square" characters and no actual text
Other than that, I'll continue to use it since it's the best option so far. The Java-based tool that I tried out, GanttProject, had too many problems, including exporting of HTML and PDF files.
I also looked at dotProject and Achievo, which are PHP-based tools that might be better suited for project management for a large project or a small company.