"Web Compiler" and "Bundler & Minifier" are other Visual Studio extensions which do some of the sorts of things Web Essentials does.

Some of the things recently pulled out of Web Essentials such as LESS support and JS minification are in the other two items. Just downloading the .vsix, double-clicking it, and running it successfully installed all three of these for me in Visual Studio 2015.

• Web Essentials 2015
• Web Compiler
• Bundler & Minifier