There are many places to get good quality vector icon for use on development purposes. Some of them will help a lot in searching for various designs according to your needs.

Few will even let you hire a freelancer to vector icon design which matches your theme. Also, some of these resources will let you edit online.

Vector icon resources

What kind of vector icons are all-time favorite or most downloaded?

The simple icons like outline icons which are not filled with any color and flat social media icons are an all-time favorite.

Best free stock images for commercial use

Flaticon

Website for vector icons, free as well as premium. Use the search box to find any style or category.

The icon editor will let you edit its size, position and colors. So you have a chance to set the icon to match your needs. Also, you can generate your font face by converting your TTF or OTF to webfonts.

Formats: PNG, SVG, EPS, PSD, Base 64, Iconfont

Visit FlatIcon

Iconfinder

One of the most used vector icons website for free and paid. Search the icon you want, get the size and use it. You will find hundreds of quality icons for free.

The editor will help you match the color. A simple yet powerful tool in your browser.

Formats: PNG, SVG, AI, CSH, ICO, ICNS

Visit iconfinder

Icons8

One-stop for vector icon, stock photo and music. Search accordingly on the site. Free are paid icons are available.

Download in vector format or embed it directly on websites. An attribute is required for free icons.

For music, you can get a limited version and unlock with monthly charges.

Format: SVG, EPS, PDF, PNG, CDN, Base64

Visit icons8

Freepik

It is a wide collection of vector icons and stock photos. It could be your best place to find all of them for different purposes. Search and purchase for the item you want also, you will get free with attributes for personal or commercial uses.

It is more than a website for icons. Vector icons, vector illustrations, backgrounds, photographs can be found there.

Format: SVG, EPS, PNG, PSD, JPG(photo)

Visit FreePik

Vecteezy

Especially for vector arts has a good collection of vector characters, icons, banner, brochure and background. A variety of designs and characters can be found. Large number of free vector arts as well as paid available.

Free download is limited for non-regstered users and requires attributes. The attribute applies to all, web use or print use.

The online editor will let you customize the icons according to your needs by changing the color, size and font.

Format: JPG, PDF, AI

Visit Vecteezy

Freeicons

A large database for free vector icons. It is all about free vector icon download and no attribute is required.

A good source for developers who are looking for basic icons and social media icons.

Format: PNG, SVG, EPS, PSD and BASE 64

Visit Freeicons