GitMind- 脑图:https://gitmind.cn/

ColouriseSG– 老照片彩化:https://colourise.sg/#colorize

LightPDF – PDF转换编辑:https://lightpdf.com/zh/

Piqsels – 无版权纠纷图库:https://www.piqsels.com/zh

在线图片加水印:https://www.yasuotu.com/shuiyin