Open-source alternatives to Koop

great circle routes in javascript

A performant binary encoding for geographic data based on flatbuffers that can hold a collection of Simple Features including circular interpolations as defined by SQL-MM Part 3.

Geometric.js is a JavaScript library for working with points, lines, polygons, and angles. It uses plain JavaScript arrays for geometry primitives, includes TypeScript declarations for editor autocomplete and type checking, and works in modern browsers and Node.js.

A really fast static spatial index for 2D points and rectangles in JavaScript.

Euclid.ts is a Typescript library for 2D geometry. It contains classes for elements like points, lines, circles, and polygons, intersection detection, as well as SVG and Canvas drawing tools. It was developed for Mathigon.org, an award-winning mathematics education project.

geotoolbox is a javascript tool for geographers. It allows one to manage GeoJSON properties (attribute data) and provides several useful GIS operations for thematic cartography. The aim of geotoolbox is to offer functions designed to handle geoJSON directly, not just single features or…

statsbreaks is a javascript package whose objective is to split (to classify/to discretize) a quantitative dataset into a (k) number of classes or thematic categories. The general aim is to create a choropleth map, for example with bertin.js.

JavaScript Topology Suite

Lightweight Node.js isochrone map server

RBush

gdal3.js is a port of Gdal applications (gdaltranslate, ogr2ogr, gdalrasterize, gdalwarp, gdaltransform) to Webassembly. It allows you to convert raster and vector geospatial data to various formats and coordinate systems.

Blazing Fast JavaScript Raster Processing Engine

geotiff.js is a small library to parse TIFF files for visualization or analysis. It is written in pure JavaScript, and is usable in both the browser and node.js applications.

SpatiaLite 5.1.1-rc0 and friends - sqlite 3.51.1, geos 3.14.1, proj 9.7.1, rttopo 1.1.0 - for node (sync API) and browser (async API).

Geolib is a geospatial calculation library and point analysis tool. It provides a collection of utilities for computing distances, bearings, and areas between coordinates, as well as converting geographic measurements and coordinate formats. The library features a Well-Known Text geometry parser to convert WKT strings into coordinate structures for polygon analysis. It includes specialized tools for geofencing and point containment, enabling the determination of whether a coordinate falls within a defined polygon or a specified radius. The toolset covers broad capability areas including loca

A compact binary encoding for geographic data.

Merge multiple GeoJSON files into one FeatureCollection.

Cesium is a JavaScript library designed for rendering high-precision 3D globes and 2D maps within web browsers. It functions as a visualization engine that leverages hardware-accelerated graphics to display complex geographic data, terrain, and imagery. The library distinguishes itself through a modular architecture that supports the streaming of massive geographic datasets. By employing tiled data delivery and hierarchical level-of-detail optimization, it maintains performance while navigating large-scale environments. It also includes a time-dynamic state management system, which synchroniz

Jo is a command-line utility designed to construct and manipulate JSON objects and arrays directly from shell arguments and standard input. It functions as a data processing tool that transforms raw input into structured formats, enabling the generation of complex payloads for APIs, configuration files, and automated data pipelines. The tool distinguishes itself through its ability to resolve hierarchical data structures using delimiter-based path definitions and its integrated type-inference engine, which automatically casts input values into native boolean, numeric, or null types. Users can

Sample heat map implementation in Javascript

BitcoinExchangeFH is a slim application to record the price depth and trades in various exchanges. You can set it up quickly and record the all the exchange data in a few minutes!

Cesium is a JavaScript geospatial visualization library and 3D globe engine designed to render world-scale environments and precision spatial data. It functions as a web-based mapping tool that displays hardware-accelerated 3D globes and 2D maps directly in a browser without requiring external plugins. The project operates as a 3D tiles renderer, utilizing the 3D Tiles open standard to stream and display large-scale geospatial datasets. It enables the visualization and analysis of high-accuracy spatial information across global environments. The library covers a broad range of capabilities,

sChandra is a document processing platform that converts images, PDFs, Word documents, spreadsheets, and other formats into structured output such as HTML, Markdown, or JSON while preserving layout. It can also extract specific data fields from invoices, contracts, or reports using user-defined JSON schemas, with citations back to source locations. The service supports form filling in PDF and image documents, document generation from Markdown, and extraction of tracked changes from Word files. The platform distinguishes itself with pipeline-based processing chains that combine multiple proces