Open-source alternatives to Libpostal

A C++17 image representation, processing and I/O library.

C++ implementation of R*-tree, an MVR-tree and a TPR-tree with C API

A command-line tool for converting heightmaps in GeoTIFF format into tiled optimized meshes.

A fast geospatial static point clustering library for C++14

Tippecanoe is a command-line tool used to generate optimized vector tiles for web maps. It converts large-scale geospatial datasets, including GeoJSON, CSV, and Geobuf files, into binary vector tiles or MBTiles SQLite databases. The project is designed to maintain map performance and visual quality across different zoom levels. It achieves this through geospatial data downsampling, which includes simplifying geometries and thinning point density to prevent tile overcrowding and keep tile sizes within specific limits. The tool provides extensive data transformation capabilities, such as attri

Award-winning software for efficient LiDAR compression

OpenOrienteering Mapper is a software for creating maps for the orienteering sport.

Libvips is a C-based image processing library designed to manipulate large visual assets through a low-memory, parallel processing pipeline. It functions as a streaming image processor that avoids loading entire files into system memory, enabling the handling of massive images in resource-constrained environments. The library distinguishes itself through a demand-driven architecture that constructs a deferred execution plan, computing only the necessary pixels for a final output. By utilizing a cache-friendly tiled processing model and memory-mapped file access, it minimizes latency and redun

Compute drainage orders in drainage basins using Strahler and Shreve methods

A command line toolkit to generate maps, point clouds, 3D models and DEMs from drone, balloon or kite images. 📷

gSLICr: Real-time super-pixel segmentation

Creating and analyzing Earth observation data cubes in R

Port to C++ of JS GeoJSON-VT for slicing GeoJSON into vector tiles on the fly

Mapnik implemention of Mapbox Vector Tile specification

You Only Look Twice: Rapid Multi-Scale Object Detection In Satellite Imagery

Entwine - point cloud organization for massive datasets

C++ library for geographical raster data analysis

Valhalla is an open-source routing engine that calculates optimal paths and travel times using OpenStreetMap data. It is built around a tiled routing graph framework, allowing map data to be organized into small geographic tiles for efficient regional updates and offline routing capability. The project distinguishes itself through a multimodal routing server that combines automobile, pedestrian, bicycle, and public transit modes into single journeys. It includes a GPS trace matching engine to align noisy coordinates to the most probable road network paths and an isochrone and matrix generator

Computational geometry and spatial indexing on the sphere

Terrain Analysis Using Digital Elevation Models (TauDEM) software for hydrologic terrain analysis and channel network extraction.

sds is a C dynamic string library that provides a memory management wrapper for heap-allocated strings. It implements binary-safe storage by tracking string lengths explicitly, allowing the library to handle null characters within data. The library distinguishes itself through a memory architecture that uses interchangeable function pointers for allocation and freeing, enabling the integration of custom memory managers. It utilizes header-stored length tracking to provide constant-time length retrieval and maintains null-terminated buffer padding to ensure compatibility with standard C string

tbox is a multi-platform C standard library and toolkit designed for portable software development. It provides a core foundation for low-level system programming through a collection of system primitives, data structures, and memory management tools. The project includes a coroutine framework for cooperative multitasking and asynchronous logic, a data structure library featuring generic containers with a consistent iterator interface, and a memory management toolkit for pool allocation and debugging of heap overflows and leaks. It also provides a network and serialization toolset for handlin

Markup is a tool for converting various documentation formats and manual pages into structured HTML. It functions as a rendering engine selector and converter that transforms raw markup files into web-ready output using a pluggable pipeline. The system identifies the appropriate rendering engine by utilizing file extensions or analyzing document content through pattern-based language detection. This allows the pipeline to handle documents where file extensions are missing or ambiguous. The project covers a broad range of content transformation, including the conversion of traditional man pag

Translate-shell is a command-line translation tool and terminal dictionary client. It allows for the translation of words, phrases, and sentences between multiple languages and provides dictionary definition retrieval and language metadata display directly within the terminal. The tool functions as a shell-based text translator that can process input from standard streams, local files, or URLs. It includes text-to-speech capabilities to play audio pronunciations of source and translated text and can automatically detect the source language of a given string. The system supports interactive s