Xmpp-announce is a project mainly written in Python, it's free.
subscription model for simple xmpp notifications. inspired by the idea of communal coffe/tea time.
Purpose:
Channel-based subscription to xmpp messages. Users can create topic-based channels, to which other users may subscribe. When a notification is triggered (currently by hitting a URL), all subscribed users receive a message via xmpp.
The inspiration for this app was coordinating a coffee break, with several people throughout the office.