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

86Health
Tool npm

dotenvx

A secure, cross-platform dotenv replacement that encrypts .env files and runs any command with decrypted secrets injected — no code changes required.

5,848
BSD 3
Used by 9
50Health
Library Go

GoGo Protobuf

A deprecated fork of golang/protobuf adding faster marshaling, custom types, and richer Go code generation for Protocol Buffers.

5,655
BSD 3
Used by 9
97Health
SDK npm

firebase-js-sdk

Google's official client SDK for building web and Node.js apps on Firebase's backend services.

5,153
Apache 2.0
Used by 9
46Health
Library PyPI

freezegun

Let your Python tests travel through time by mocking datetime, time, and uuid calls to a fixed or ticking moment.

4,532
Apache 2.0
Used by 9
72Health
Library Go

image-spec

Canonical Go types and embedded JSON Schema validation for the OCI Image Format specification.

4,502
Apache 2.0
Used by 9
49Health
Library npm

lz-string

Fast, dependency-free LZ-based string compression for JavaScript and TypeScript

4,439
MIT
Used by 9
92Health
SDK PyPI

Elasticsearch Python Client

The official Python client for querying, indexing, and managing an Elasticsearch cluster

4,392
Apache 2.0
Used by 9
73Health
Library Cargo

ndarray

An n-dimensional array library for Rust with array views, slicing, and BLAS-backed numerics

4,332
Other
Used by 9
41Health
Library npm

notistack

Stackable, customizable notification snackbars for React, shown with a hook or a single function call.

4,078
MIT
Used by 9
88Health
SDK Cargo

rmcp

The official async Rust SDK for building Model Context Protocol clients and servers

4,045
Apache 2.0
Used by 9
72Health
Library Cargo

tokio-postgres

A native, asynchronous PostgreSQL client for Rust built on Tokio

4,021
Apache 2.0
Used by 9
70Health
Tool npm

unplugin-auto-import

Auto-imports Vue, React, and other JS APIs on demand, generating TypeScript declarations across Vite, Webpack, Rollup, Rspack, and esbuild.

3,799
MIT
Used by 9
87Health
Library npm

Virtua

A zero-config, ~3kB virtual list and grid component for React, Vue, Solid, and Svelte

3,752
MIT
Used by 9
90Health
Library PyPI

websocket-client

A low-level, dependency-free WebSocket client for Python supporting both synchronous and event-driven connections.

3,712
Apache 2.0
Used by 9
45Health
Library PyPI

python-pptx

Create, read, and update PowerPoint presentations programmatically in Python

3,563
MIT
Used by 9
89Health
Tool npm

Rsbuild

Rspack-powered build tool that gives web projects fast, zero-config bundling and a rich official plugin ecosystem.

3,407
MIT
Used by 9
48Health
Library Go

sessions

Cookie and filesystem session management for Go's net/http, with pluggable backends and key rotation.

3,149
BSD 3
Used by 9
73Health
Library npm

figlet

Full FIGfont-spec ASCII art text renderer for Node and the browser

3,036
MIT
Used by 9
44Health
Library npm

@microsoft/fetch-event-source

A fetch()-powered client for Server-Sent Events that supports headers, request bodies, and retries

2,890
MIT
Used by 9
44Health
Library PyPI

Bleach

Allowlist-based HTML sanitizing library for untrusted text

2,765
Apache 2.0
Used by 9
72Health
Library PyPI

feedparser

Parses RSS, Atom, RDF, CDF, and JSON feeds into one normalized Python dictionary.

2,450
Other
Used by 9
87Health
Library npm

html-react-parser

Converts HTML strings into React elements, working seamlessly on both server and client

2,432
MIT
Used by 9
44Health
Library npm

react-copy-to-clipboard

A tiny React component that wraps any element to copy text to the clipboard on click.

2,367
MIT
Used by 9
66Health
Library npm

react-highlight-words

A React component that highlights matching search terms within a body of text

2,303
MIT
Used by 9

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