Directory

Open Source Packages

Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.

5929 packages

All Packages

75Health
Library Go

memberlist

A Go library implementing the SWIM gossip protocol for decentralized cluster membership and failure detection.

4,127
MPL-2.0
Used by 4
85Health
Tool Composer

Laravel Octane

Boots your Laravel application once and keeps it resident in memory on Swoole, RoadRunner, or FrankenPHP for dramatically faster request handling.

4,049
MIT
Used by 4
44Health
Library npm

jsQR

A pure JavaScript library that locates, extracts, and decodes QR codes from raw image data, with no native dependencies.

4,042
Apache 2.0
Used by 4
60Health
Library Go

cast

Safe, predictable type conversion for Go — turn any value into the exact type you need without panics.

3,980
MIT
Used by 4
68Health
Library npm

react-native-share

Native share sheets and direct social-app sharing for React Native, from a single cross-platform API.

3,899
MIT
Used by 4
77Health
Library npm

amqplib

The promise- and callback-based AMQP 0-9-1 client for Node.js, built for connecting to and messaging over RabbitMQ.

3,847
MIT
Used by 4
90Health
Library Go

go-json

A fast, drop-in replacement for Go's encoding/json that skips reflection in favor of compiled opcode execution.

3,753
MIT
Used by 4
70Health
Library Go

Glamour

Stylesheet-based Markdown rendering that turns plain text into styled ANSI output for Go CLI apps.

3,742
MIT
Used by 4
81Health
Library Go

runtime-spec

Go structs for the OCI Runtime Specification — the container config, state, and features schema shared by runc, containerd, and CRI-O.

3,695
Apache 2.0
Used by 4
63Health
Library Go

go-i18n

Go i18n library for translating apps into 200+ languages with full CLDR plural support and a companion CLI.

3,549
MIT
Used by 4
95Health
Library Composer

Device Detector

Universal PHP library for parsing user agents into browsers, OS, and device info

3,543
Other
Used by 4
56Health
Library npm

cuid

A collision-resistant, sequential ID generator for Node and browsers

3,502
MIT
Used by 4
80Health
Library npm

floating-vue

Vue 3 tooltips, dropdowns, and menus powered by Floating UI for smart, viewport-aware positioning.

3,459
MIT
Used by 4
64Health
Library Cargo

Symphonia

A 100% safe, pure-Rust audio decoding and media demuxing library supporting MP3, FLAC, AAC, ALAC, Vorbis, Opus, WAV, and more.

3,448
MPL-2.0
Used by 4
74Health
Library Composer

composer/semver

PHP semantic version comparison, constraint parsing, and validation library from the Composer team

3,305
MIT
Used by 4
91Health
Library PyPI

pycryptodome

A self-contained, low-level Python library of cryptographic primitives — ciphers, hashes, MACs, and public-key algorithms — with no OpenSSL dependency.

3,281
Other
Used by 4
87Health
SDK npm

TanStack AI

Type-safe, provider-agnostic TypeScript AI SDK for streaming chat, tool calling, agents, and multimodal apps.

3,235
MIT
Used by 4
58Health
Library PyPI

django-environ

Configure Django apps with twelve-factor environment variables and URL-based settings.

3,172
MIT
Used by 4
91Health
Library PyPI

kombu

A Python messaging library giving Celery and other apps one high-level API over AMQP, Redis, SQS, and a dozen other broker transports.

3,151
BSD 3
Used by 4
50Health
Library npm

Vue Demi

A compatibility shim for writing one library that works across Vue 2 and Vue 3

3,126
MIT
Used by 4
74Health
Library npm

next-safe-action

Type safe and validated Server Actions for Next.js, with typed errors, middleware, and React hooks for execution state.

3,079
MIT
Used by 4
87Health
Library PyPI

mistune

A fast, CommonMark-compliant Python Markdown parser with a pluggable AST, swappable renderers, and a rich plugin system.

3,078
BSD 3
Used by 4
70Health
Library npm

webextension-polyfill

A lightweight polyfill that gives Chrome extensions Firefox's Promise-based browser API namespace.

3,066
MPL-2.0
Used by 4
84Health
Library Composer

symfony/browser-kit

Simulates a web browser in PHP — navigate pages, click links, and submit forms programmatically

3,007
MIT
Used by 4

Join founders buildingwith open source

Opinionated takes, migration guides, cost-saving tips, and insights from the open source ecosystem.

Subscribe on Substack
Join 750+ subscribers