Alliance-subscriptions-plugin is a project mainly written in Java, it's free.
A PlugIn for Alliance where you can subscribe to a friend's folder
Alliance Subscriptions PlugIn
This allows you to subscribe to a friend's Alliance share folder and get their changes automatically.
STATUS
The functionality is written, and it detects changes just fine, but it gets to the part where it should schedule a download and then... nothing. Well, sometimes it actually works: if I set the last_any_modified field in the subscription setting then it'll usually download one or more of the files, so I know that the download code CAN work (eg. the ViewShareMDIWindow.download() approach). But most often it gets to the System.out where it's trying a download approach and then just fails to do the download. Annoying! Anyway, hopefully I'll get an answer on this issue: http://code.google.com/p/alliancep2pbeta/issues/detail?id=36
USAGE
This is built to work with the latest trunk (r 235 at http://code.google.com/p/alliancep2pbeta). It may work work with the latest official release 1.0.6, but I haven't tried it.
To add this plugin, go to View, then Plugins, and point to the jar file.
To add a subscription, go to the Debug Console and enter a 'newfsub' command. Here's the basic syntax:
newfsub FRIEND-GUID FRIEND-SHARE FRIEND-SHARE-SUB-DIR MY-LOCAL-DIR 0
Here's an example:
newfsub 1643718002 alliance-on-trunk subscribe-to-this/ /Users/tlarson/dev/alliance/working-trunk2/working/sub-to-trunk 0
You'll probably have to look in your settings.xml file to find your friend's GUID.