Best Open Source Libraries 2025

Libraries

Libraries Search Engines Clear Filters

Browse free open source Libraries and projects below. Use the toggles on the left to filter open source Libraries by OS, license, language, programming language, and project status.

Our Free Plans just got better! | Auth0
With up to 25k MAUs and unlimited Okta connections, our Free Plan lets you focus on what you do best—building great apps.

You asked, we delivered! Auth0 is excited to expand our Free and Paid plans to include more options so you can focus on building, deploying, and scaling applications without having to worry about your security. Auth0 now, thank yourself later.

Try free now
Simple, Secure Domain Registration
Get your domain at wholesale price. Cloudflare offers simple, secure registration with no markups, plus free DNS, CDN, and SSL integration.

Register or renew your domain and pay only what we pay. No markups, hidden fees, or surprise add-ons. Choose from over 400 TLDs (.com, .ai, .dev). Every domain is integrated with Cloudflare's industry-leading DNS, CDN, and free SSL to make your site faster and more secure. Simple, secure, at-cost domain registration.

Sign up for free
1

PHPCrawl

PHPCrawl is a high configurable webcrawler/webspider-library written in PHP. It supports filters, limiters, cookie-handling, robots.txt-handling, multiprocessing and much more.

8 Reviews

Downloads: 1 This Week

Last Update: 2015-01-27
See Project
2

Simple Fast Dictionary

Simple, small and fast dictionary lib on C

The library does quick search of dictionary words in arbitrary input strings. Known problems are known. :) See appropriate section in documentation. Also, only ASCII words and strings for now.

Downloads: 0 This Week

Last Update: 2013-05-30
See Project
3

eBayAPIs for Delphi

Implements a class framework for access several eBay-APIs in a native Delphi like manner. Currently it supports the Shopping-API and the Finding-API.

Downloads: 0 This Week

Last Update: 2013-04-18
See Project
4

jBingAPI

jBingAPI is a java library to query the microsoft search engine bing (http://www.bing.com/) using their public api. jBingAPI just makes it a lot easier to communicate with this api.

Downloads: 0 This Week

Last Update: 2016-08-09
See Project
Gen AI apps are built with MongoDB Atlas
The database for AI-powered applications.

MongoDB Atlas is the developer-friendly database used to build, scale, and run gen AI and LLM-powered apps—without needing a separate vector database. Atlas offers built-in vector search, global availability across 115+ regions, and flexible document modeling. Start building AI apps faster, all in one place.

Start Free
5

jQuery.hilite

A comprehensive jQuery plugin that provides various text highlight capabilities.

Downloads: 0 This Week

Last Update: 2014-05-14
See Project