Recommend a Linux or browser-based Venn diagram drawing tool

Question

I'm looking for a tool to draw good-looking Venn diagrams, for use on a Linux-based PHP site, which already employs Flash for graph drawing (Open Flash Chart 2). Free (as in beer or speech) would be nice, but isn't essential.

So it should be one of the following (in my rough order of preference):

• Browser based (Flash)
• PHP library
• Linux command line app
• Web service

So far the options I'm aware of are:

• Google Charts
• Write something myself using PHP GD or Flash

Answer 1

Use the Google chart api.

Answer 2

Write something yourself using PHP GD or Flash.

Answer 3

Use Venny

Very easy to use and goes up to four groups.