pdf和小工具和在线工具
在线工具
https://tcp.ping.pe
https://www.processon.com/login
chrome://sync-internals/
https://www.wolframalpha.com/
https://leetcode.cn/problemset/all/
https://plantuml.com/zh/
https://javaguide.cn/
https://cesium.com/learn/cesiumjs-learn/cesiumjs-quickstart/ //3dJS
https://jupyter.org/
https://github.com/Snailclimb/JavaGuide
https://chat.openai.com/chat
https://fastgood.cheap/ //不可能三角
VeraCrypt：https://github.com/veracrypt/VeraCrypt //加密工具
https://app.mockplus.cn //产品经理在线工具
www.neat-reader.com //epub阅读器
http://downsub.com/ //在线下载字幕
https://repl.it/site/blog/multi //有趣的编辑器
https://www.tiobe.com/tiobe-index/ //排名
appannie.com //全球看榜单最好的工具
https://www.jiumodiary.com/ //pdf
https://sk.kindleshare.cn //Kindleshare电子书搜索引擎
LICEcap //动态图
编码：隐匿在计算机软硬件背后的语言
