Remove Unused Site Files
Dreamweaver "Check Links"
After Dreamweaver checks links in your Local Site folder, it also provides you with a report of all unused files, which you can either delete or re-link.
Orphan File Checkers
Xenu Link Sleuth (Win only) this no-frills, free utility does a number of things well including finding broken links on your web site, creating site maps and more. Don't be deceived by Xenu's small file size (1 MB) or simplicity. It actually works very well.
Inspyder's OrFind will "crawl your site" and identify HTML pages and images that are no longer used. The software can be configured to automatically delete those files, and it will even email you a report if any files are modified. This can provide a webmaster with peace of mind, knowing that if their webspace gets hacked, they'll be alerted. There is a free trial available. Afterward, you need to pay for the software to continue using it.
HTML Link Validator, released in 2007 by Lithops Software, will check your website for any broken links, regardless of the number of pages your site has. This software is another class of "web spider" which sifts through your web pages and identifies orphan web site files. The software is Shareware, but you need to register and pay to use the full version.
FindOrphan is a simple application created by SobolSoft that will search your local HTML, PHP and ASP files for any unlinked files, including media files like images and video.
Linx Explorer from NOVOSIB software will verify all links on your website to check for broken links, and it will also detect any unlinked files in your web directory and provide you with a report.
SiteCleaner is Mac software created by Sideburn Studios that will take all of the files and code for your web project and "clean it" of all orphaned html or media files. Removed files are placed in a "removed content" folder.
Remove Unused CSS Code
Dust-Me Selectors is a browser Add-on available for Firefox 3.5+ and Opera 11.50+. Dust-Me extracts all the selectors from all the stylesheets on the page you're viewing, then analyzes that page to see which of those selectors are not used. The data is stored so when testing subsequent pages, selectors can be crossed off the list as they're encountered. You can test pages individually, or spider an entire site, and you'll end up with a profile of which selectors are not used anywhere.
Unused CSS for Chrome Chrome Web Store
UnCSS with Grunt, Broccoli or Gulp get it from GitHub
Minify your CSS Code
