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 and TRIX, plus candlestick pattern recognition. Docs: https://ta-lib.org Available natively in C/C++, Java, Rust and C# with wrappers for python, R and many other ecosystems. MOVED TO GITHUB: https://github.com/TA-Lib/ta-lib . No further support is provided on SourceForge. Release 0.4.0 is very outdated, please check github for the most recent release.

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

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/

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.

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.

TradingDeskPro is a Windows app for market charts, paper trading with virtual funds, and trade review. It offers candlestick charts, technical indicators, simulated orders, AI-assisted analysis, a local trade journal, backtesting, and market replay. Use 2 charts on Free, 4 on PLUS, or 5 on MAX. Features include pre-trade checklists, Ghost Mode, anti-tilt warnings, strategy drafts, daily debriefs, Telegram/Discord alerts, and 50 languages with automatic Windows language detection. Manual crypto API trading is Free. PLUS adds optional local AI and advanced review tools. MAX adds brokerage/FX APIs, AI paper trading, and optional cloud sync. AI-assisted real-account orders require two warnings and confirmation for every order. (As I am Korean, I am not fluent in English, so I wrote most of the explanation with the help of AI. I ask for your understanding!) (*STRICTLY COPYRIGHTED. ILLEGAL DISTRIBUTION IS PROHIBITED. PLEASE INCLUDE THE WEBSITE NAME SHARING.*)

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 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.

www.dims.com ERP for SMEs developed with dgp21 environment that provides a high speed connection, just using the 5% of the data traffic of a web based application. It covers the general needs of a SME: finance, accounting, manufacturing, stocks...

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

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

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

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.

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.

GnoTime (formerly GTT, the Gnome Time Tracker) is a desktop utility for tracking the amount of time spent on projects, keeping a to-do list, maintaining a diary, and generating reports and invoices based on that time.

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

Stansoft is a Linux financial accounting software system for business. It is designed for data entry efficiency with an ncurses text-based terminal user interface. Developed using Aubit4GL / Informix 4GL with a PostgreSQL or Informix database engine. Demonstration videos can be found on the YouTube channel at https://www.youtube.com/@standardsoftware.

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

MoneyTrack is a personal financial recording system, means it keeps track of your incomes / expenses via a database which can be accessed in different ways. There are several frontends available (web frontend, java-client, ...).

On-line peer-to-peer payment system.

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.