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

98Health
Library PyPI

SciPy

Fundamental algorithms for scientific computing, optimization, and statistics in Python.

15,144
BSD 3
Used by 22
56Health
Library Cargo

rayon

Simple, guaranteed data-race-free work-stealing parallelism for Rust — turn sequential iterators parallel by changing one call.

13,398
Apache 2.0
Used by 22
92Health
Library Go

gopsutil

A Go library that ports Python's psutil, giving programs a pure-Go way to read CPU, memory, disk, network, host, sensor, and process statistics across every major OS.

11,936
BSD 3
Used by 22
84Health
Library Go

go-sqlite3

A self-contained CGO driver that brings SQLite3 to Go's standard database/sql interface.

9,260
MIT
Used by 22
41Health
Library Go

mapstructure

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

8,011
MIT
Used by 22
82Health
Library PyPI

attrs

Python classes without boilerplate — generate init, repr, equality, and more from declarative field definitions.

5,860
MIT
Used by 22
71Health
Library Go

golang-lru

HashiCorp's generic-typed, thread-safe LRU cache for Go, with ARC, 2Q, and TTL-expiring variants.

5,129
MPL-2.0
Used by 22
82Health
Library npm

p-queue

Promise queue with concurrency control, interval-based rate limiting, and priority scheduling for async tasks.

4,298
MIT
Used by 22
94Health
SDK PyPI

Google Gen AI Python SDK

The official Python SDK for calling Google's Gemini and generative AI models via the Gemini API and Vertex AI.

4,040
Apache 2.0
Used by 22
80Health
Library Cargo

sysinfo

Cross-platform Rust library for fetching system information — CPU, memory, disks, processes, and networks

2,753
MIT
Used by 22
87Health
Library PyPI

AnyIO

High-level async concurrency and networking API that runs on both asyncio and Trio

2,560
MIT
Used by 22
83Health
Library npm

otplib

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

2,298
MIT
Used by 22
89Health
Library Cargo

time

Ergonomic, no-std-compatible date and time handling for Rust with parsing, formatting, and macro literals.

1,344
Apache 2.0
Used by 22
95Health
Library PyPI

OpenTelemetry Instrumentation for kafka-python

Automatic OpenTelemetry tracing for the synchronous kafka-python producer and consumer

1,119
Apache 2.0
Used by 22
47Health
Library npm

tiktoken

Fast BPE tokenizer for OpenAI models, providing WASM and pure-JS bindings for Node, browsers, and edge runtimes.

1,073
MIT
Used by 22
42Health
Library npm

util

A browser-compatible implementation of Node.js's util module

254
MIT
Used by 22
37Health
Library npm

remark-breaks

A remark plugin that turns soft line breaks into hard breaks without needing spaces or escapes.

155
MIT
Used by 22
93Health
Framework PyPI

LangChain

The most widely adopted Python framework for building LLM-powered agents and applications

148,339
MIT
Used by 21
91Health
Tool PyPI

Black

The uncompromising Python code formatter that ends style debates with deterministic formatting

41,999
MIT
Used by 21
98Health
Framework Composer

Laravel

The expressive, elegant PHP framework for building modern web applications

34,975
MIT
Used by 21
79Health
Library PyPI

loguru

A drop-in replacement for Python's standard logging module that makes logging enjoyable, with almost no setup required.

24,153
MIT
Used by 21
53Health
Library npm

Vue.Draggable

Vue 2 drag-and-drop component built on Sortable.js for reorderable lists

20,552
MIT
Used by 21
53Health
Library npm

Mustache.js

Logic-less {{mustache}} templates for JavaScript, running anywhere JS runs.

16,723
MIT
Used by 21
93Health
Library Cargo

hyper

A fast, low-level HTTP client and server library for Rust supporting HTTP/1 and HTTP/2

16,372
MIT
Used by 21

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