I have registered to GitHub, now i have to translate the modules before upload
xguestbook is here:
http://metalslug.altervista.org/xfguestbook.zip
I inserted captcha code set to from the xoops core. The secure code can be activated from the module setting.
I added a hidden text form empty because only captcha code doesn't stop all spam, but is no problem if you have many spam messages you can set approve before publishing
Missing some word in english, is it almost complete.