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

56Health
Library npm

totp-generator

Generate TOTP one-time passcodes from a secret key using the native Web Crypto API, with a pure-JS fallback.

314
MIT
Used by 2
73Health
Library PyPI

cbor2

Fast Python CBOR serializer and deserializer with extensive tag support

311
MIT
Used by 2
38Health
Library npm

useFilePicker

A React hook that opens the browser's native file selector, reads file contents, and validates selections by type, size, and count.

306
MIT
Used by 2
44Health
Library PyPI

requests-kerberos

Kerberos and GSSAPI authentication support for Python Requests

305
Other
Used by 2
53Health
Library PyPI

python-lz4

C-accelerated Python bindings for LZ4, covering the frame, block, and streaming compression formats.

303
BSD 3
Used by 2
64Health
Library Cargo

oci-spec

Strongly typed Rust structures for the OCI Image, Runtime, and Distribution specifications.

300
Apache 2.0
Used by 2
39Health
Library PyPI

Hyperlink

Immutable, Pythonic, and correct URLs based on RFC 3986 and 3987.

297
MIT
Used by 2
43Health
Library npm

node-xmlrpc

A pure JavaScript XML-RPC client and server for Node.js, with no native C dependencies for parsing or building XML.

297
MIT
Used by 2
45Health
Library npm

split2

A Node.js Transform stream that splits a text stream into a stream of lines.

297
Other
Used by 2
37Health
Library PyPI

Textual Autocomplete

Adds autocomplete dropdowns to Textual Input widgets in Python terminal UIs.

296
MIT
Used by 2
31Health
Library Cargo

fuzzy-matcher

Fast fuzzy string matching for Rust, powering the skim fuzzy finder

295
MIT
Used by 2
38Health
SDK npm

node-acme-client

A simple, unopinionated Node.js client for the ACME protocol, automating certificate issuance from Let's Encrypt and other CAs.

295
MIT
Used by 2
79Health
Library npm

material-symbols

Variable Material Symbols icon fonts and CSS, auto-updated daily with the latest icons from Google.

293
Apache 2.0
Used by 2
33Health
Library Cargo

fxhash

A fast, non-cryptographic hashing algorithm from Firefox and rustc for high-speed Rust HashMaps and HashSets.

291
Other
Used by 2
84Health
Framework npm

InversifyJS

A lightweight, decorator-driven IoC container that brings SOLID-friendly dependency injection to TypeScript and JavaScript apps.

291
MIT
Used by 2
34Health
SDK npm

plausible-tracker

A lightweight, dependency-free TypeScript client for sending custom events and page views to Plausible Analytics.

289
MIT
Used by 2
85Health
SDK npm

node-sdks

The official Node.js realtime SDK for LiveKit, giving server-side apps a typed client for audio, video, data streams, and RPC over WebRTC.

284
Apache 2.0
Used by 2
84Health
Library npm

free-email-domains

A continuously updated JSON list of free and disposable email domains for filtering signups and scoring leads.

282
MIT
Used by 2
85Health
Library npm

express-handlebars

A Handlebars view engine for Express that restores layouts, partials, and smart caching stripped out of Express 3.x.

281
BSD 3
Used by 2
29Health
Library npm

Deepdash

Deep tree-traversal methods for Lodash and plain JavaScript objects

280
MIT
Used by 2
36Health
Library Cargo

const_format

Compile-time string formatting and concatenation for Rust, producing static strings.

279
Other
Used by 2
81Health
Library Cargo

maxminddb-rust

A Rust library for reading MaxMind DB files, including GeoIP2 and GeoLite2 geolocation databases, with typed decoding and optional memory-mapped access.

279
Other
Used by 2
50Health
Tool Cargo

jemalloc_pprof

Convert jemalloc heap profiles to pprof format for memory leak and OOM debugging

278
Apache 2.0
Used by 2
34Health
Library npm

Typanion

Zero-dependency runtime and static type validator for TypeScript, with type-safe schemas, detailed errors, and value coercion.

274
MIT
Used by 2

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