Demonstrate all the questions on LeetCode in the form of animation.（用动画的形式呈现解LeetCode题目的思路）

Free and Open Source, Distributed, RESTful Search Engine

#1 Locally hosted web application that allows you to perform various operations on PDF files

Netty project - an event-driven asynchronous network application framework

http下载工具，基于http代理，支持多连接分块下载

Empowering Data Intelligence with Distributed SQL for Sharding, Scalability, and Security Across All Databases.

Logstash - transport and process your logs, events, or other data

Arduino IDE 1.x

Pentaho Data Integration ( ETL ) a.k.a Kettle

Tutorials for using RabbitMQ in various ways

Open source routing engine for OpenStreetMap. Use it as Java library or standalone web server.

停车场系统源码，新能源充电桩系统，停车场小程序，智能停车，Parking system，【功能介绍】：①兼容市面上主流的多家相机，理论上兼容所有硬件，可灵活扩展，②相机识别后数据自动上传到云端并记录，校验相机唯一id和硬件序列号，防止非法数据录入，③用户手机查询停车记录详情可自主缴费(支持微信，支付宝，银行接口支付，支持每个停车场指定不同的商户进行收款)，支付后出场在免费时间内会自动抬杆。④…

a proxy for sharding databases and tables