The company blog hasn't been updated for a whole month. Recently, the entire company has been busy with two things: doing customization for Haier Group and OEM for a partner, but things are finally taking shape. During this period, we often used some tools and help sites. Today, I read an article that introduced 15 extremely useful sites for web designers and developers. Quite a few of these are ones we've been using all along. They might be useful to many people, so I'm translating it to share with my colleagues.