Filu is aimed to support your stock trading. Some of its features are: Market Scanner, Indicator scripting, TA-Lib support, Postgres driven FIs and indicators, Trading scripting, Backtester with optimizer functionality
A perl/Gtk2 GUI for VNUML (http://www.dit.upm.es/vnuml/). This GUI will let you quick prototype your VNUML topology by graphically placing, linking and editing network elements, reading/writing VNUML files and run your simulation right from the GUI.