Directory

Command-line program to sync, copy, mount and serve files across dozens of cloud storage providers and protocols, with optional client-side encryption

Component-based JavaScript library for building user interfaces, created at Meta, with hooks, a declarative rendering model and server components

Canada's national consumer portal for MLS listings, operated by CREA's REALTOR.ca Canada Inc., with licensed data syndication through the DDF

In-memory key-value data store used as cache, message broker and database, with data structures, Pub/Sub, Streams and, since Redis 8, built-in JSON, search and time-series modules

Official online access to Québec's land register: index of immovables, registered deeds and rights by lot number, run by the provincial government

Volunteer-run decentralized bibliographic database of economics research, fed by institutional archives and served through IDEAS, EconPapers, the Author Service, CitEc, NEP and MPRA

Literature-discovery app that grows collections of papers through citation and author networks and recommends related work, with a free-forever tier

Encrypted, deduplicating backup program written in Go that stores snapshots in local, SFTP, S3-compatible and many cloud backends

Python library for quantitative portfolio optimization with many risk measures, robust estimators and hierarchical clustering models

Québec's municipal property assessment rolls: per-unit values and building attributes published by municipalities and as open data by the MAMH

Gordian's construction cost database of unit prices, assemblies and square-foot models with location factors, sold online and in annual books

Posit's open-source integrated development environment for R, with console, editor, plots, environment panes, Quarto/R Markdown authoring and Python via reticulate

Compiled systems programming language with ownership-based memory safety, the Cargo build tool and no garbage collector

BSD-licensed Python machine-learning library for classification, regression, clustering, dimensionality reduction, preprocessing and model selection on NumPy and SciPy

Core open-source Python library for scientific computing on NumPy arrays: optimization, integration, interpolation, linear algebra, sparse matrices, statistics, signal processing

Citation-analysis platform whose Smart Citations show whether later papers support, contrast or merely mention a claim, with an AI assistant and reference checking

Web scraping API with anti-bot bypass, JavaScript rendering, cloud browsers, screenshots, AI extraction and a crawler, billed in credits per request

Mature open-source Python framework for writing crawlers (spiders) that fetch pages asynchronously, extract structured items and export them through pipelines

The SEC's free public filing system: company and full-text search, bulk index and feed archives, and data.sec.gov JSON APIs for submissions and XBRL financial facts, subject to a fair-access rate policy

Free AI-assisted literature search from Ai2 with an Academic Graph API, recommendations and downloadable datasets of papers, authors and citations

Static analysis engine that matches code patterns written in the target language's own syntax, with an LGPL community edition and a commercial AppSec platform

Python library for computing and training embedding, cross-encoder reranker, sparse and multi-vector retrieval models, maintained by Hugging Face with thousands of pretrained models on the Hub

API that returns live search-engine result pages from Google and other engines as structured JSON, with localization, device and search-type parameters

Collection of accessible React components built on Radix primitives and Tailwind CSS that are copied into a project's source rather than installed as a dependency