A curated collection of open source fintech libraries and resources. This is not a complete list, so please feel free to submit a pull request adding a project with a short description! Actively maintained projects with great documentation are preferred.
- Calculators
- Charts
- Credit card forms
- Currency handling
- Education
- Icons
- Integrations
- Personal finance
- Sanctions
- Stock data
- Subscriptions and billing
- Other
- Accrue.js - a loan and interest calculation plugin for jQuery
- finance - a library for financial calculations in Ruby
- node-sales-tax - international sales tax calculator for Node
- py1040 - a U.S. personal income tax calculator
- amCharts - a simple and flexible drop-in data visualization solution
- finance-go - a financial markets data library implemented in Go
- Lightweight Charts - display financial data as an interactive chart on your web page without affecting loading speed and performance
- react-financial-charts - charts dedicated to finance with multiple types, interactive indicators, overlays, and drawing objects
- Card - a better credit card form in one line of code
- Payment - a jQuery-free general purpose library for building credit card forms, validating inputs, and formatting numbers
- accounting - money and currency formatting for Golang
- accounting.js - a tiny JavaScript library for number, money, and currency parsing/formatting
- currency.js - a lightweight library for handling currency values and built to work around floating point issues in JavaScript
- Dinero.js - an immutable library and API to create, calculate, and format monetary values
- Open Exchange Rates - a real-time JSON API that provides exchange rates (forex/fx rates) for 150+ currencies, relative to USD
- CryptoList - curated collection of blockchain and cryptocurrency resources
- deep-finance - datasets, papers, and books on AI and finance
- Fintech dictionary - simple definitions of fintech terms and acronyms
- PaymentFont - a sleek webfont featuring popular payment methods
- payment-webfont - an SVG webfont full of payment system and ecommerce icons
- paypal-checkout-components - JavaScript integration for PayPal Button and PayPal Checkout
- react-native-payments - for integrating payments like Apple Pay and Google Pay into your React Native app
- Budget - a web application that helps you keep track of your finances by organizing and visualizing transactions
- Firefly III - a self-hosted manager for personal finances to track expenses and income
- Ghostfolio - a web-based wealth management application to keep track of your financial assets like stocks, ETFs or cryptocurrencies and make solid, data-driven investment decisions
- Mintable - automate personal finances without ads and data collection
- OnTrack - a simple, self-hosted budgeting app to understand and control spending without giving banking/financial info to a third party
- OpenSanctions - an open database of international sanctions data, persons of interest, and politically exposed persons
- Watchman - offers search functions over numerous trade sanction lists from the United States
- google-finance - Python module to get stock data from Google Finance
- JCStockGraph - display historical price graphs for any stock in your iOS app
- TuShare - a utility for crawling historical data of China stocks
- yahoo-finance - Python module to get stock data from Yahoo Finance
- BoxBilling - billing, client, and order management software designed to be easy-to-use for both clients and sellers
- Crater - web and mobile app that helps freelancers and small businesses track expenses/payments and create professional invoices and estimates
- Invoice Ninja - invoice clients, facilitate payments, track time/tasks, handle expenses, and more (built with Laravel and Flutter)
- Kill Bill - an SaaS-like subscription management and billing solution with real-time analytics and financial reports
- Manta - flexible invoicing desktop app with diverse and customizable templates
- Recurly.js - create subscriptions, process one-time transactions, and update customer billing information
- ach - a reader, writer, and validator for Automated Clearing House (ACH) files
- Akaunting - online accounting software designed for small businesses and freelancers
- Apache Fineract - core banking solution for financial institutions offering services to the world’s two billion underbanked and unbanked
- fredapi - Python API for FRED (Federal Reserve Economic Data) and ALFRED (Archival FRED)
- go-finance - Go library containing a collection of financial functions for time value of money (annuities), cash flow, interest rate conversions, bonds, and depreciation calculations
- Gringotts - a simple and unified API to access dozens of different payment gateways with very different APIs, response schemas, documentation, and jargon
- pyfolio - portfolio and risk analytics in Python
- Sequence - immutable, scalable, and easy to use ledger service
- XChange - Java library that provides a simple API for interacting with 60+ cryptocurrency exchanges, delivering a consistent interface for trading and accessing market data