Review on Canjs by Tony Reid

The code for creating components can be seen in the source itself, which makes it easy to customize your UI even if you're not an expert coder.

Although I love how simple this component library is with so many ready made components already available that are of high quality. There's nothing much I dislike about this product as such, but some things could have been better like documentation (which should definitely improve), pricing & licensing model. This was really helpful when building my first website with drag n drop features without using any front end frameworks or plugins.