⏰ Day.js 2kB immutable date-time library alternative to Moment.js with the same modern API

AI agent toolkit: coding agent CLI, unified LLM API, TUI & web UI libraries, Slack bot, vLLM pods

The official Python library for the OpenAI API

A powerful JavaScript library for interacting with the Discord API

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

Collection of comprehensive TypeScript libraries for Interaction with the Ethereum JSON RPC API and utility functions.

Cross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library.

A tiny scalar-valued autograd engine and a neural net library on top of it with PyTorch-like API

Zepto.js is a minimalist JavaScript library for modern browsers, with a jQuery-compatible API

flink learning blog. http://www.54tianzhisheng.cn/ 含 Flink 入门、概念、原理、实战、性能调优、源码解析等内容。涉及 Flink Connector、Metrics、Library、DataStream API、Table API & SQL 等内容的学习案例，还有 Flink 落地应用的大型项目案例（PVUV、日志存储、百亿数据实时去重、监控告警）分享。欢迎大家支持我的专栏《大数据实时计算引擎 Flink 实战与性能优化》

🕷 Super-agent driven library for testing node.js HTTP servers using a fluent API. Maintained for @forwardemail, @ladjs, @spamscanner, @breejs, @cabinjs, and @lassjs.

QuestPDF is a modern library for PDF document generation. Its fluent C# API lets you design complex layouts with clean, readable code. Create documents using a flexible, component-based approach.

Tink is a multi-language, cross-platform, open source library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.

Google's officially supported Node.js client library for accessing Google APIs. Support for authorization and authentication with OAuth 2.0, API Keys and JWT (Service Tokens) is included.

Pure Python 3 MTProto API Telegram client library, for bots too!

LangChain4j is an open-source Java library that simplifies the integration of LLMs into Java applications through a unified API, providing access to popular LLMs and vector databases. It makes implementing RAG, tool calling (including support for MCP), and agents easy. LangChain4j integrates seamlessly with various enterprise Java frameworks.

Go library for accessing the GitHub v3 API

Official JavaScript / TypeScript library for the OpenAI API

A PHP client library for accessing Google APIs

Deep learning library featuring a higher-level API for TensorFlow.

The automatic type-safe REST library for .NET Core, Xamarin and .NET. Heavily inspired by Square's Retrofit library, Refit turns your REST API into a live interface.

🐍 The official Python client library for Google's discovery based APIs.

List of libraries, tools and APIs for web scraping and data processing.

Charts library for Android compatible with API 8+, several chart types with scaling, scrolling and animations 📊

A Python library for the Docker Engine API

C# library and console app for using new feature control APIs available in Windows 10 version 2004 and newer

An open source, portable, easy to use, readable and flexible TLS library, and reference implementation of the PSA Cryptography API. Releases are on a varying cadence, typically around 3 - 6 months between releases.

🔥 The fastest and powerful Python library for Instagram Private API 2026 with HikerAPI SaaS

Go library for the WhatsApp web multidevice API

URL routing library for iOS with a simple block-based API