QuantLib is a cross-platform, quantitative finance C++ library for modeling, pricing, trading, and risk management in real-life. It is also wrapped as Python/Ruby/Scheme modules. Extensions for Excel, R, and Mathematica are available. Other such extensions are under consideration. QuantLib offers tools that are useful both for practical implementation and for advanced modeling. It features market conventions, yield curve models, solvers, PDEs, Monte Carlo (low-discrepancy included), exotic options, VAR, and so on.
Makecheque is a tool (written in Ruby) to print bank cheques, either using bank-supplied stationey, or blank check paper (in conjuntion with a MICR font and perhaps special laser toner). It is intended to be used as part of an interactive bookkeeping system. Makecheque quickly and easily prints large batches of checks based on textual format specifications given as standard input and emits ready-for-printer Postscript on standard output.
PortfolioTracker allows you to track and manage your stock portfolio of Euronext shares in real time (with a 15 second delay). You can use it to assess your stock positions (price, daychange, gain, gain%, value, weight%) with one command. Portfolio changes are easily maintained in a text file. PortfolioTracker is a twin project of QuotesViewer (http://quotesviewer.sourceforge.net).
openSteam is a generic e-commerce framework for Ruby on Rails. Its goal is to simplify the implementation of a Web shop. It features a generator to create a Web shop quickly, generators to create products and properties, a shopping cart, a checkout process, inventory entry for products or specific product configurations, and an administrative backend to overview customer and order information.