OAFF is a script which searches for players on OA servers (you have to populate a list of friends with their nicknames or clan tags), and allows you to join the server they're on.
The program works on GNU/Linux and on MS Windows, or any platform which has the right Perl libraries installed.
The Perl libraries are required (the instructions help you to install them).
License: GNU GPL3
Changes: An English and Italian manual is included - With the configuration-file oaff-config.pl you have a graphic control about the OA executable and friendlist (screenshot).