Open-source alternatives to Decimal

number-precision is a JavaScript math library and arbitrary precision arithmetic utility. It provides a set of functions for performing addition, subtraction, multiplication, and division while avoiding the rounding errors common in standard binary floating-point operations. The project focuses on maintaining controlled decimal precision to ensure consistent mathematical output. This makes it applicable for financial calculations where exact currency values are required, as well as for high precision data processing in scientific or technical reports. Its capabilities include precise floatin

bignumber.js is an arbitrary-precision JavaScript library designed to perform mathematical operations on decimals and integers that exceed the limits of standard floating-point numbers. It functions as a decimal arithmetic engine and a math library for calculating square roots, powers, and modular exponentiation. The project provides a base conversion utility capable of parsing and translating numeric values between any base from 2 to 36. It also includes a numeric formatting tool for rendering high-precision values into localized strings with custom separators and notation styles. The libra

Actual is a local-first personal finance manager designed to help users track income, manage expenses, and maintain a balanced budget. It functions as a data-centric application that prioritizes offline access and local file storage, ensuring that financial records remain available and performant regardless of network connectivity. The platform distinguishes itself through a robust architectural foundation that emphasizes data integrity and auditability. Every financial action is recorded as an immutable sequence of events, and all currency values are processed using an integer-based arithmet

Math.js is a comprehensive JavaScript library for scientific, complex, and arbitrary precision calculations. It functions as a symbolic computation engine, a linear algebra toolkit, a statistical analysis library, and a unit conversion system. The project distinguishes itself by providing a symbolic engine capable of parsing, simplifying, and manipulating mathematical expressions algebraically without requiring immediate numerical evaluation. It includes a framework for defining and converting physical quantities with units of measure and automatic prefix support. The library covers a broad

decimal.js is a JavaScript arbitrary precision library designed to perform mathematical calculations without the rounding errors associated with standard floating-point numbers. It provides a high-precision math toolkit for executing basic arithmetic and advanced transcendental functions with configurable significant digits. The library implements decimal-based math that supports various rounding modes and arbitrary precision settings. It includes a numeric string parser for converting decimal, hexadecimal, binary, and octal strings into high-precision numeric types, as well as a utility for

SciPy is a scientific computing library for Python that provides a comprehensive collection of mathematical algorithms and numerical tools for research and engineering. It functions as a high-performance numerical analysis framework, bridging high-level Python code with compiled C and Fortran routines to execute complex computations at hardware speeds. The library is built upon array-based data structures that utilize strided memory layouts to enable efficient data manipulation and slicing. By employing vectorized operation dispatch and linking to optimized hardware-specific linear algebra li

This project is a comprehensive educational curriculum designed to teach Python programming through the lens of data science and financial analysis. It provides a structured guide for learning how to process complex numerical information, build data models, and perform scientific computing tasks using standard industry libraries. The materials focus on practical applications, enabling users to develop skills in financial data analysis and interactive exploration. By working through these resources, learners gain experience in executing high-performance mathematical operations, transforming ra

LAPACK is a comprehensive library of Fortran routines designed for high-performance numerical analysis and linear algebra. It serves as a foundational scientific computing framework, providing standardized procedures for solving systems of linear equations, eigenvalue problems, and least squares approximations. The library distinguishes itself through a hierarchical routine abstraction that organizes mathematical operations into distinct levels of complexity. It utilizes block-partitioned matrix algorithms and a column-major memory layout to optimize data locality and hardware efficiency. By

This project is a comprehensive technical reference and programming cheatsheet for the Python language. It serves as a curated catalog of language features, syntax patterns, and standard library functions designed to help developers identify and apply correct coding patterns. The documentation covers a broad range of functional areas, including language fundamentals such as object-oriented structuring, functional logic, and list comprehensions. It also provides guidance on utilizing the standard library for data analysis, file management, networking, and concurrent execution. The reference e

xtensor is a C++ multidimensional array library for numerical computing that provides N-dimensional containers with an interface mirroring the NumPy API. It utilizes a lazy evaluation expression engine to defer numerical computations until assignment, which minimizes memory allocations and intermediate copies. The library features a foreign memory array adaptor that allows it to wrap external buffers, such as NumPy arrays, to perform numerical operations in-place without duplicating data. It further optimizes performance through lazy broadcasting and a system that manages the lifetime of temp

Technical Analysis Library for Golang

Go package for dealing with EU VAT. Does VAT number validation & rates retrieval.

Currency handling for Go.

Golang library for querying and parsing OFX

Go implementation of Fowler's Money pattern

Matching Engine for Limit Order Book in Golang

Finance related Go functions (e.g. exchange rates, VAT number checking, …)

Go library containing a collection of financial functions for time value of money (annuities), cash flow, interest rate conversions, bonds and depreciation calculations.

Embedded database for accounts transactions.

This project is a comprehensive, community-maintained knowledge base and toolkit designed for competitive programming. It serves as a centralized repository for algorithmic theory, data structures, and mathematical techniques, providing a structured reference for informatics and collegiate programming competitions. The project distinguishes itself by integrating educational content with a robust suite of automation utilities. It provides a complete workflow for competitive programming, including tools for automated test case generation, solution verification, and direct interaction with onlin

Presto is a distributed SQL query engine designed for high-performance analytical processing across heterogeneous data sources. It functions as a data federation platform and massively parallel processing engine, allowing users to execute interactive queries against diverse storage systems without requiring data migration. By mapping remote metadata and structures to a unified relational namespace, it enables seamless cross-platform analysis through a standard SQL interface. The engine distinguishes itself through a pluggable connector architecture and a shared-nothing distributed processing

This project is an open source discovery resource that provides curated lists of reusable code and libraries to help developers find technical solutions for specific tasks. It utilizes a category-based indexing system to organize diverse software tools by their functional capabilities. The repository is structured as a collection of markdown-based documentation and static content, serving as a directory for manual discovery and reference. The directory covers a wide range of capability areas, including cross-platform application development, cybersecurity tool creation, network protocol impl

Sass is a stylesheet compilation engine and CSS preprocessor that extends standard CSS with variables, nested rules, mixins, and functions. It functions as a comprehensive design system tool, enabling developers to organize complex stylesheets into modular, reusable components while automating the transformation of advanced syntax into browser-compatible CSS. The project distinguishes itself through its sophisticated build automation and language-level extensibility. It provides robust support for programmatic style generation, including conditional logic, iterative loops, and unit-aware math

Locutus is a multi-language utility library and polyfill collection written in TypeScript. It provides a comprehensive set of implementations for standard library functions from various programming languages, enabling developers to use familiar semantics and behaviors across different technical environments. The library functions as a cross-language standard library, porting core logic and utilities from diverse languages into a type-safe TypeScript toolset. It focuses on maintaining consistent behavior through a polyfill-based design that replicates the original functionality of these foreig