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RubyMoney is a widely adopted Ruby library that provides a robust and precise way to represent and manipulate monetary values in software applications. It is designed around the principle that financial calculations must avoid floating point errors, and therefore represents values internally as integers in the smallest currency unit, such as cents. The library introduces a Money class that encapsulates both the numeric value and the associated currency, ensuring that operations are always...

Frankfurter is an open-source currency exchange rate API that provides reliable financial data based on reference rates from institutional sources such as the European Central Bank. It is designed to be simple, transparent, and free to use, with no API key requirements or usage limits, making it particularly attractive for developers and small projects. The API offers endpoints for retrieving the latest exchange rates, historical data, and time-series data, enabling both basic conversions...

QuickFIX is the worlds first Open Source C++ FIX (Financial Information eXchange) engine, helping financial institutions easily integrate with each other. The SVN repository is now locked. Latest code is hosted at github. https://github.com/quickfix/quickfix

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.

OpenSourceBilling or OSB is a simple, open source web application for creating and sending invoices, receiving payments, managing clients, and tracking and reporting. There’s no need to pay for these services because OSB does it all for free and easily. OSB can produce reports of sales, payments and collected revenues, and simply makes billing and invoicing hassle-free. OSB comes with plenty of built-in features, such as recurring invoices, exporting to PDF, time tracking, receiving...

A quantitative finance C++ library for modeling, pricing, trading, and risk management in real-life. A cross-platform free/open-source tool for derivatives and financial engineering.

Fixer is a lightweight and developer-friendly API service designed to provide real-time and historical foreign exchange rate data for a wide range of global currencies. It aggregates financial data from multiple sources, including institutions like the European Central Bank, to deliver accurate and frequently updated exchange rates. The API supports over 170 currencies and offers multiple endpoints that allow developers to retrieve latest rates, perform currency conversions, and analyze...

An account book software using Ruby/GTK.

zena is a state-of-the-art CMS (content managment system) based on Ruby on Rails with a focus on usability, ease of customization and web 2.0 goodness (application like behaviour).

An Excel addin and server framework for implementing remote excel user-defined functions (UDFs). This framework is designed to provide a centralised warehouse of functions for Excel users (eg. within an organisation).

Primarily this is a console program written in ruby and generate a german form for money transfer from one bank to another and it's a frontend for a PSTricks-Package. It generates a PS or PDF file for printing.

Coupa e-Procurement is a requisition and purchase order system with best-in-class usability. Built to manage employee purchasing, it includes catalog management, shopping cart buying, approvals, purchase orders and more. Built in Ruby on Rails.

Manage small to medium size of hotels, holiday flats, guesthouse or rent-a-car. Online booking and visual availability is provided. Grouping of active members give communitys the ability to provide online booking service.

A robust internet café administration toolkit. A very simple GUI to manage various systems running different operating systems. The main scripting language is Ruby using GTK for its GUI.

Rails web application for automating donations transactions.

Billing system solution. Library for credit card/ACH processing, recurring billing and subscription management for member and donor centered organizations. Provides a way for POS / retail / recurring credit card and bank account processing.

Grism allows you to easily track the evolution of stock prices through watchlists, portfolios and charts. You can observe stocks, ETFs, indices and mutual funds from every major stock market in the world.

This is database backed web application for the management of investment clubs (a type of partnership.) The purpose is to do allow members of an investment club to manage members, monthly dues, voting, meeting minutes, track stock portfoltios and more.

This project will use rails to implement an auction-based exchange system. It is targeted for use with bots on online-RPGs, but the software will be usable in auctioning any items of standardized quality.

Web based donation collection web-application, shows summary and more detailed donation information. Simple "contest" can be done.

Web-based business accounting software, written using the ruby on rails framework, primary designed for italian laws and regulations

Track and manage your stock portfolio of Euronext shares in realtime (15' delay). Assess your stock positions (price, daychange, gain, gain%, value, weight%) with one command. Easy portfolio description in a text file. Twin project of QuotesViewer.

A real-time graphical stockmarket simulator using Ruby-SDL

YASW is inactive and deprecated in favor of Grism: http://www.grism.org

Hoster is a solid software aimed at the management of a small web hosting company. Hoster provides full administration of client accounts, domain customization, invoice and receipt printing and everything needed to run a small web hosting business.