There are 3 must-use reference sites for any Graphic Designer who wants speed in his-her workflow.
Freepik:
As the name suggests is free mainly and is a huge library of vectors, icons, psd, and photos. You could find really anything in their library.
The UI (graphic interface) of the site is nice and clean, with many options for searching purposes to minimize the time you spend. It’s really thoughtful if you think about it.
If you haven’t been used them already I think you going to love them.
Brandsoftheworld:
Is also a huge library but this time for logos (vector files). You could find plenty of logos from a coca-cola logo to UEFA (football) logo ready to be downloaded for many formats such as eps, ai, cdr, etc.
This site is a time saver for me at least. How many times have you had to make a banner, poster, or just a flyer and your client didn’t have the logos, and you make a promise to make them for him or her, and with that promise, you spent a great deal of time to make it happen? I know, it happened to me a lot.
Flaticon:
It’s a massive collection of icons. You could find beautiful icons in their collection from minimal to realistic one. They provide both, bitmaps for many sizes and vector files. This site is also highly recommended if you want speed on your workflow.
For any Graphic Designer is pure gold for many reasons as you can imagine. Time, quality, quantity, etc.
Bonus sites:
As Graphic Designers many times we also use photos for our concepts. If you have a short budget you could use two of my favored reference sites to download free photos, with no restriction on copyrights.
I highly recommended both of them, they are both great.
Conclusion:
New technology and new platforms try to make our life as a Graphic Designer to be more productive and have more speed in our way. We must take advantage of such technology and platforms.