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

77Health
Library npm

ignore

A pure JavaScript manager, filter, and parser for .gitignore-style rules, built exactly to the gitignore spec.

501
MIT
Used by 29
90Health
Library npm

Smithy Core (@smithy/core)

The shared runtime orchestration layer that powers every AWS SDK for JavaScript v3 client, unifying middleware, serialization, retries, and auth.

324
Apache 2.0
Used by 29
73Health
SDK npm

@sentry/vite-plugin

Official Vite plugin that uploads source maps and manages releases directly to Sentry at build time.

177
MIT
Used by 29
45Health
Library npm

JSON5

JSON for humans: an extended JSON syntax with comments, trailing commas, and unquoted keys for hand-written config.

7,162
MIT
Used by 28
59Health
Library npm

ts-morph

Navigate and manipulate TypeScript code with a friendlier compiler API wrapper

6,179
MIT
Used by 28
36Health
Library Cargo

hex

Encode and decode data to and from hexadecimal in Rust, with no_std and serde support.

272
Apache 2.0
Used by 28
95Health
Library PyPI

PyArrow

Python bindings for Apache Arrow's columnar in-memory format, giving pandas, NumPy, and data pipelines a fast, zero-copy way to move and process tabular data.

17,110
Apache 2.0
Used by 27
69Health
Library npm

query-string

Parse and stringify URL query strings in JavaScript with flexible array, number, and boolean handling.

6,906
MIT
Used by 27
71Health
Tool npm

webpack-bundle-analyzer

Turns webpack build stats into an interactive, zoomable treemap so you can see exactly what's bloating every bundle.

12,656
MIT
Used by 26
91Health
Library PyPI

jsonschema

The reference implementation of JSON Schema validation for Python, supporting every draft from 3 to 2020-12.

4,980
MIT
Used by 26
63Health
Library npm

jsonc-parser

A fault-tolerant scanner and parser for JSONC (JSON with comments), with SAX-style visiting, DOM trees, and edit APIs.

758
MIT
Used by 26
90Health
Library npm

cssnano

A modular CSS minifier built on the PostCSS ecosystem, composing dozens of swappable optimization plugins into safe, lite, and advanced presets.

4,976
MIT
Used by 25
78Health
Library npm

postcss-preset-env

Converts tomorrow's CSS syntax into code today's browsers understand by auto-selecting PostCSS polyfill plugins from your browserslist targets.

1,052
Other
Used by 25
50Health
Library Cargo

serde_yaml

Strongly typed YAML serialization and deserialization for Rust, built on Serde

1,018
Apache 2.0
Used by 25
46Health
Library npm

openapi-types

Type-safe TypeScript definitions for OpenAPI 2.0, 3.0, and 3.1 specification documents, covering paths, schemas, and components.

921
MIT
Used by 25
84Health
Tool npm

svgo

A Node.js library and command-line tool that optimizes SVG files by removing redundant markup through a configurable plugin pipeline.

22,669
MIT
Used by 23
94Health
Library Cargo

rustls

A modern, memory-safe TLS library for Rust with no unsafe code and no legacy crypto by default.

7,619
Other
Used by 23
46Health
Tool npm

file-loader

A webpack loader that resolves file imports into emitted assets and public URLs

1,843
MIT
Used by 23
83Health
Library PyPI

Charset Normalizer

A pure-Python universal charset detector that turns text of unknown encoding into clean Unicode.

794
MIT
Used by 23
39Health
Library npm

path-browserify

Node.js path module implementation for browser environments

192
MIT
Used by 23
60Health
Library Go

gjson

Fast, dependency-light JSON value extraction for Go using dot-notation paths.

15,558
MIT
Used by 22
41Health
Library Go

mapstructure

A Go library for decoding generic map values into strongly typed structs, and back again.

8,023
MIT
Used by 22
95Health
Tool PyPI

setuptools

The standard build backend that turns Python source trees into installable wheels and sdists for pip and PyPI.

2,857
MIT
Used by 22
78Health
Library npm

otplib

TypeScript-first TOTP and HOTP library with a pluggable crypto/base32 architecture for Node, Bun, Deno, and browsers.

2,290
MIT
Used by 22

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