Fasten ASP.NET Websites Easily: RequestReduce
RequestReduce is a free and open source ASP.NET resource that can quickly improve the speed of the websites.
It offers automated image-spriting, minification of JS-CSS and optimizes caching headers.
There is almost no details to configure for standard usage, it is more a plug 'n' play solution and works with any IIS-powered website (ASP.NET, ASP, PHP, etc.).
RequestReduce works with files that are hosted anywhere (locally or remotely) and can also compile Less, Sass or CoffeeScript.