Open Heartbeat
Stock quote distribution and management services and applications.
Open Heartbeat is a lightweight data distribution system designed primarily for collecting and distributing rapidly changing price quotes for stocks, securities or other distributable data sets.
The core component is a reusable library which manages all communication, synchronisation, caching etc., which can be linked into applications that create or, more commonly, consume data.
Primarily aimed at the financial sector, as a way to distribute rapidly changing stock quotes etc...