https://codepen.io/ The best place to build, test, and discover front-end code
https://neumorphism.io/
https://alteredqualia.com
https://coolbackgrounds.io/
免费画UML类图的网址https://www.processon.com/ 注册即用
小巧的截图工具Snipastehttps://zh.snipaste.com/ 按F1截图，F3置顶