Hi there,
With this post, I would like to introduce you to a website link where you can free of charge download Icon packs for your development works, they have hundreds of packs in different collections, all you have to do is to select the right one and download it to your Computer.
https://all-free-download.com/
Some information from the site as follows;
To Customize Desktop Icons:
License Agreement Says:
These icons are distributed under a Creative Commons Attribution-No Derivative Works 3.0 Unported License.
You are free: to Share — to copy, distribute and transmit the work under the following conditions:
Attribution. You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
No Derivative Works. You may not alter, transform, or build upon this work.
For any reuse or distribution, you must make clear to others the license terms of this work. The best way to do this is with a link to the http://creativecommons.org/licenses/by-nd/3.0/ web page.
Any of the above conditions can be waived if you get permission from the copyright holder.
Nothing in this license impairs or restricts the author’s moral rights.
It means the icons are free for personal use and also free for commercial use, but we require linking to our web site. If you don’t want to place a link, purchase them for $199 per set.
N++ Studios 
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