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.
OutGoing is a Perl script that is designed to aid with financial planning. It takes a list of your regular monthly outgoings and generates an HTML file that details the total amount of money going out for the month, a week-by-week breakdown, and a list of the payments left during the remainder of the month.
QuoteFilter is a companion to Xinvest and Xquote. You can use it to filter your emails messages and process the contents of some messages to retrieve stock quotes from them. The quote information can be stored in the files that Xinvest uses so that you'll automatically use recent information. Xquote serves a similar purpose, but it retrieves stock quote information from Internet servers.