There is no dearth of mind-blowing open source stuff available for web developers in this world. However, this is mostly limited to "raw material" ...
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These admin templates always look really good but it's rare that I need one as a starting point on projects.
How many times have you needed something like this?
That's true, it's not so often used in web projects, most of which just need a submit form and a few widgets typically. Only when the user needs an admin dashboard to have a sense of control (with charts, data-grids, etc.), are such templates useful.