Open Source Ruby Financial Software

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

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 and more advanced financial analysis. It allows users to specify base currencies and filter results by selected currencies, making responses efficient and customizable. The system can be used directly from client-side applications or self-hosted for full control over data access. Its lightweight design and straightforward JSON responses make integration easy across web and mobile environments.

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 context-aware and accurate. It also includes a Money::Currency class that stores metadata such as currency codes, symbols, and formatting rules, enabling consistent handling of international currencies. The library supports arithmetic operations, comparisons, and currency conversion through configurable exchange rate providers, making it suitable for both simple and complex financial systems.

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 payments through Paypal and credit card, Freshbooks and Quickbooks data importing and more. It also supports several different languages as well as currencies.

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.

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.

AUSten -, for using time dollars and other alternative currencies. An online system for managing alternative currencies. This is good for time banks, time dollars and local exchange trade systems (LETS). Developers are members of Austin Time Exchange

alice_invoice provides a simple ruby interface for downloading invoices and corresponding digital signatures from German ISP Alice.

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.

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.

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.

Dividing Bills is a Ruby on Rails project that allows to divide bills easily by creating users groups and receipts, to keep a searchable history of all bills, and to keep track of everything by email or RSS feed.

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 historical trends over time. One of its key strengths is its simplicity, as it uses straightforward RESTful endpoints and JSON responses that can be easily integrated into web or mobile applications. Fixer also supports time-series and fluctuation data, enabling more advanced financial analysis and forecasting use cases. While a free tier is available with some limitations, more advanced features such as higher request limits and additional base currencies are offered through paid plans.

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

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.

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.

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.

The Marketcetera Trading Platform is a comprehensive open-source software infrastructure for algorithmic trading, that is a true alternative to expensive, monolithic proprietary systems or brittle software mashups.

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

OnMyMeans is a budget application built using Rhomobile's Rhodes mobile application development framework.

Peatio is an open-source, Ruby on Rails–based core engine for building cryptocurrency exchange platforms. It serves as the accounting and trading backbone of the OpenDAX stack, designed around microservices. Peatio is a free and open-source cryptocurrency exchange implementation with the Rails framework. This is a fork of Peatio designed for microservices architecture. We have simplified the code in order to use only the Peatio API with external frontend and server components. Our mission is to build an open-source crypto exchange software with a high-performance trading engine and incomparable security. We are moving toward dev/ops best practices of running an enterprise-grade exchange. We provide webinar or on-site training for installing, configuring, and administering the best practices of Peatio.

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.

The Risk-o-Mat will provide the user with a web based overview of her or his risk position. helping small/medium sized businesses to valuate their risks, and manage preventive and reactive measures. The main focus is on the german situation.

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.

An open source point-of-sale (POS) appliaction, running on ruby-on-rails / MYSQL under linux. Features a till, product management, stock control, ordering, customer accounts and invoicing, per-user security and banking. Front-end is any web browser.