If you are a UI designer, creating custom icons is often more trouble than it's worth since you probably already spent an inordinate amount of time dealing with a range of application states, device sizes, and UX guidelines. Instead of reinventing the wheel for every project, consider using assets from Icons8.
Icons8 is a massive online library with thousands of professionally crafted vector icons for you to freely use in your digital designs. Used by companies like Apple, Intuit, and Adobe, Icons8 has over 54,000 items in their collection. Everything is organized into easily browsable categories and tags, so you'll be able to assemble your own unique assortment for your next project. Their icons can be integrated directly into Photoshop and Xcode, and you can even embed them into website HTML with helpful codes.
You can register for a lifetime subscription through the Boing Boing Store for $49.
