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.
Who's Paying for This? is a Python app for payment share calculation. It simplifies the task of figuring out what share of the grocery bills each of roommate is obligated to pay when some items are not used by all roommates. Just launch the script with each person's name as a command line argument and you'll get a GUI. Type in the name of the item on the receipt, the price of the item, check the boxes for the people who are paying for the given item, and click the button to add it to the list. The program keeps a running count, and lists the price paid for individual items.
Custom is an E-Commerce system providing Ordering and Invoicing, Stock, Supplier, and Catalogue Management. Easily customisable, it is written in Python for use as CGI scripts (under Apache or any other Web server) with a simple example site and example database. Custom is intended as a modern replacement for Sage.
PyLETS_CGI is a simple Web-based accounting database intended for mutual credit systems, including LETSystems, time-dollar systems, community barter networks, and babysitting circles. It is suitable for low transaction volumes, where file locking is considered adequate to provide concurrent file access and the cost or continuous memory loading involved in using a relational database is considered a disadvantage. The administrator is able to add accounts and input transactions. Users are optionally able to make payments out of their own accounts into other accounts within the network, check their own and other users' account balances, and view their own trading statements.
avsap is a powerful, flexible, and complete financial accounting package. It supports double entry book keeping, cash and bank books, ledger, journal, customizable chart of accounts, template voucher entry, custom reports, year closure, customizable financial years, and multiple login levels. It is multi-user out of the box, acid compliant, fast, and user friendly.
Tiny ERP is a complete ERP and CRM. The main features are accounting (analytic and financial), production management (MRP), stock management, sales and purchases management, task automation, marketing campaigns, help desk, POS, etc. Technical features include a distributed server, flexible workflows, an object database, a dynamic GUI, an XML-RPC interface, and customizable reports.