The term SDK stands for software development kit. It is a collection of tools that allow developers to build software for specific platforms. An SDK can consist of (but is not limited to) a compiler, debugger, libraries, documentation, and code samples.
微信开发 Java SDK ，支持包括微信支付，开放平台，小程序，企业微信，视频号，公众号等的后端开发
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
iText for Java represents the next level of SDKs for developers that want to take advantage of the benefits PDF can bring. Equipped with a better document engine, high and low-level programming capabilities and the ability to create, edit and enhance PDF documents, iText can be a boon to nearly every workflow.
card.io provides fast, easy credit card scanning in mobile apps
The Android SDK for Parse Platform
Chat SDK Android - Open Source Mobile Messenger
Alibaba Cloud SDK for Java
MinIO Client SDK for Java
微信支付 APIv3 的官方 Java Library
Official Android Tracking Library for Mixpanel Analytics
The Alexa Skills Kit SDK for Java helps you get a skill up and running quickly, letting you focus on skill logic instead of boilerplate code.
微信tinker补丁管理，后端代码+客户端sdk
微信支付 APIv3 Apache HttpClient装饰器（decorator）
Countly Product Analytics Android SDK