twstools is a simple set of command line tools around the Interactive Brokers TWS API with the purpose of having a powerful scriptable toolbox to automate "jobs" like downloading historical data, tracking account info or submitting orders, etc.
twsapi is a portable C++ API for Interactive Brokers TWS. It is almost identical to the original IB C++ Posix API. It contains several bugfixes and usage improvements, and uses the autotools build system.
QtStock is a tool that helps private investors and investment clubs to do Fundamental Analysis and Portfolio Optimization. It is based on a NAIC-like approach.
JShorter is simple tool which fetches the daily short data from FINRA's main site while allowing you to extract the short data for the symbol you choose.