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.
The Open-Transactions project is a collaborative effort to develop a robust, commercial-grade, fully-featured, free-software toolkit implementing a full-strength financial cryptography library, API, CLI, and prototype server. Open-Transactions democratizes financial and monetary actions. You can use it for issuing currencies/stock, paying dividends, creating asset accounts, sending/receiving digital cash, writing/depositing cheques, cashier's cheques, creating basket currencies, trading on markets, scripting custom agreements, recurring payments, escrow, etc. Strong crypto is used. Balances are unchangeable (even by a malicious server). Receipts are destructible and redundant. The transactions are unforgeable. The cash is untraceable. The cheques are non-repudiable.
The GNOME Structured File Library is a utility library for reading and writing structured file formats. Support for MS OLE2 streams is complete, as is zip import. There is also support for document metadata and some initial work on decompressing VBA streams in OLE files for future conversion to other languages. This library replaces libole2 and is used in gnumeric, mrproject, abiword, libwv2, koffice. It is also part of the AAF format.
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.
PyKota is a full featured, internationalized, centralized, and extensible print quota system for CUPS. It supports PostgreSQL, OpenLDAP, MySQL, or SQLite as the quota database backend. This software features most of what you might expect from a modern print quota and accounting solution. Its flexibility and configurability greatly eases its integration into your own computing environment.
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.