QuickFIX/J is a full featured messaging engine for the FIX protocol. - This is the official project repository.

Interactive Brokers API wrapper and trading toolbox

An exchange matching engine that is a conceptual emulation of Nasdaq or NYSE. The system asynchronously handles buy, sell, and modify order requests from buyers and sellers in the market. The requests are asynchronously handled via an order book that will fill requests or keep them pending based on a FIFO matching algorithm.

A project for the simulation of stock markets.

Provides API for parsing broker reports from various file formats

Atom : an Agent-Based Financial Artificial Market in Java. Build yourself in silico experiments

An adapter that returns Morpheus DataFrames from Quandl.com

Java implementation of the absolute return model described in the paper by Gontis et al. (Physica A, 2010).