Logomakr.com is a website that allows you to make a free logo. Using the online interface you can add prebuilt images or create something a little more custom. You can search for icons that fit your company. You can then save the logo as a PNG. The website will give you text to use in order to site the source of your logo.
This logo was created in the Logomakr overview video below.
Speaker graphic by Freepik from Flaticon is licensed under CC BY 3.0. Made with Logo Maker