Having trouble installing plug-ins, themes, and WordPress core updates on a localhost WordPress instance? Here’s the most likely cause and solution.
OS X has a built in web server. For some users, especially web developers, it may come in rather handy. You can use it for locally hosting web sites (typically for development purposes), for running a local WebDAV server (which may, for instance, come in handy for local syncing of apps like OmniFocus). Here’s how to start and stop Apache on OS X.
If you do web design on your Mac, you may need to create FAVICON files (ICO files). If you use Photoshop, here’s how to save a FAVICON / ICO file on Photoshop CS5, CS6, and CC.