Open Source C Financial Software

GnuCash is a personal and small-business finance manager with a check-book like register GUI to enter and track bank accounts, stocks, income and expenses. GnuCash is designed to be simple and easy to use but still based on formal accounting principles.

Technical analysis library with indicators like ADX, MACD, RSI, Stochastic, TRIX... includes also candlestick pattern recognition. Useful for trading application developpers using either Excel, .NET, Mono, Java, Perl or C/C++.

Grisbi is a very functional personal financial management program with a reasonable set of homefinance features.

esniper was a lightweight console application for sniping eBay auctions. *It does not work anymore.* The development stopped in 2020 because ebay has changed the login mechanism in a way we could not handle in the existing code.

OTS is a safe, secure, easy-to-use program for calculating Tax Return Form entries, and determining your tax-owed or refund-due, for Federal or State personal income taxes. Includes updated versions for US 1040, Schedules A, B, C, D, and for several states. OTS provides both graphical and textual interfaces for quickly filing out your tax forms. --- Best way to download the correct version for your platform -- go to the OTS WEBSITE: =====> https://opentaxsolver.sourceforge.net/

A multiplatform C++ library for dynamic generation of Excel .xls files containing multiple worksheets. Unlike .csv files, these can be directly opened by Excel and thus provide an excellent way to output large data sets that require further analysis. To see the latest changes, select "Files" and view the README text displayed at the bottom of that pane. IMPORTANT: Major changes are contained in the current SVN source. If you have time please try to use it or the xlslib-package-2.4.0b1.zip archive, and enter bug reports on any problems! Changes: - library specific strings now in their own namespace - iOS Objective-C library - most project files updated (MSVS etc) - C bridge now supports formulas Note: there is a related SF project, libxls, to read Excel files.

A library to check bank account numbers and bank codes (BLZ) of German Banks. It is based on the specifications of the "Deutsche Bundesbank".

XonGrid is a free Excel library of functions to perform 1D, 2D, 3D, 4D and arbitrary dimension (ND) interpolations from scattered data.

«HomeBank» is the software you have always wanted to manage your personal accounts. It brings you many features to analyze your finances in a detailed way instantly and dynamically with powerfull report tools based on filtering and graphical charts.

A real-time financial derivatives calculator supporting 171+ models from QuantLib, Financial Numerical Recipes in C++ and MetaOptions. Matrices of prices are created with iterating strikes and/or months. A strike control system can produce any strike. A generalized date engine can calculate re-occuring distances to any industry used expiration into the future. Spread engine with spread views. Models Supported: Black-Scholes, Merton-73, Black-76, Roll Geske Whaley, Garman KohlHagen, Jump Diffusion, Quanto, Vasicek Bond Option, Turnbull Wakeman Asian, TimeSwitchOption, Look Barrier, Bachelier, PartialTimeBarrier, GapOption, Extreme Spread Option, Simple Chooser, ComplexChooser, PartialFixedLB, Executive, CashOrNothing, Extendible Writer, OptionsOnOptions, BAWAmericanApprox, BSAmericanApprox, AssetOrNothing, Bisection, BAWbisection, BSbisection, Gfrench, Gcarry, Swapoption, Complex Chooser, Super Share, EquityLinkedFXO, Spread Approximation, BinaryBarrier and more

This is a C library to check the validity of German and Austrian Bank Account Numbers. All currently defined test methods by Deutsche Bundesbank (Dec 2017: 00 to E4) are implemented. Modules for AWK, Perl, PHP, Python, Ruby, C#.net and VB.net are included too. The package includes also an IBAN converter to generate (german) IBANs and BICs from account data. All currently defined IBAN rules by Deutsche Bundesbank are implemented (Dec 2017: 57 rules) and tested against independent solutions.

muhasebeci is a free accounting program. it is for all size firms.

Read data from Excel 97+ spread sheets without Microsoft! Provides an API to write applications that read Excel documents. The xlreader tool converts data to tab delimited, CSV or SQL inserts. Written in C. Based on the the Java version by Andrew Khan.

Port of GRISBI a GPL accounting manager (http://www.grisbi.org/) under Windows. Depending of the GRISBI version the port should be done using CYGWIN or in a native way. You will found here all stuff needed to install, use and compile GRISBI under Windows

A library to generate the bidimensional barcode PDF417. The generated result is a byte array representing the barcode image that can be included in the users application.

Beanie is a flexible, distributed open-source accounting system for medium-sized companies. It includes back-end batch processing as well as a GTK GUI. It provides automated purchases, sales and nominal ledgers as well as automated invoicing (via email).

GkrellStock monitors stock quotes for given Tickers from various markets (USA, Europe, Canada, Asia, Australia).

Getting your first mortgage? No, this isn't spam, its mort! A simple but powerful loan/mortgage calculator that also amortizes.

gBilling is a Internet Cafe Billing System consists of Server and Client, gBilling is especially made in Indonesian Language, run in Linux and Windows, written in C and GTK2.

This is the LibOFX library. It is a parser and an API designed to allow applications to support the OFX banking standard (mostly used for bank statement download). To my knowledge, it is the first working OpenSource implementation on the client side.

A Gnome panel applet for stock tracking. It is similar to the Gnome Stock Ticker shipped with Gnome. However, it offers 2 advantages: 1) Better UI to track a small number of stocks. 2) Real time last trade price from Yahoo FN.

GnuCash Portable provides a PortableApps.com style NSIS launcher enabling GnuCash to run from a portable drive without installing it on the host machine.

Utility to validate, extract, show and create digital documents included in files with "pk7" and "fp7" extensions such as electronic bills provided by some phone companies in Spain like Movistar and Telefonica.

Fireworkz combines the features of Wordz (a word processor that you can use to write letters, reports, books, invitations, shopping lists, schedules and other documents) and Resultz (a spreadsheet that you can use to perform calculations, analyse figures, and produce colourful charts) enabling you to do even more; incorporate live results in your reports, or perform an automatic mail-merge to your friends or customers. If you are using Microsoft® Windows®, Linux or macOS, and don't know what RISC OS is, you may be better off using LibreOffice!

This program takes an ascii input text file and converts it to the pdf417 barcode. It supports text compression, numeric compression and byte compression. It currently produces postscript and pbm output for the barcode image. produces post