These are my top for Tips for Free Website Tools, they are the ones I have sent to more clients than any other:
Need to figure out what font is being used by a client or one you just like? Upload a graphic with the font to: http://www.myfonts.com/WhatTheFont/ they will help you determine what the font is. Then go find a free font download site to get the font.
Graphics loading too slow or out of space on your web hosting? Upload your graphics files here to reduce the file size without compromising quality. https://tinypng.com/
Need a graphic for your blog post? These are by far the best two sites for royalty free photos: https://unsplash.com/