[tlug] Content management system

["Michael Engel" <mkengel@example.com>]

Hello.
While the topic is not 100% Japanese, we would be grateful for some advice.

We are working on a free Chinese-German* dictionary:
HanDeDict <http://chdw.de>.
*We will also have some functions for Japanese in one of the future versions.

We would like to work a little bit more professionally and are looking
for an OpenSource management system which allows several users to work
together - even on the same document.

Could you please recommend us products which are if possible multi-OS
(Linux, Windows + eventually Macintosh) ?

While we have looked at several sites, we do not have experience with
such products and would therefore need some guidance.

Thank you very much in advance.
Best regards

Michael Engel