Free business directories
Business Search Engine 
Business.com is a business director, where you can “quickly find anything for your business”. Categories include accounting, finance, education, business travel, construction, health care, human resources, industrial goods, internet, jobs, legal, management & strategy, office management, restaurants, retail, sales & marketing, software, startup, technology, and transportation.
Euro Pages
Euro Pages touts itself as the “European B2B Search Engine”. You can search for companies listed in the directory by business name or by product type. You can go to the “Buy & Sell” section to find B2B purchase requests or list your own business request. Lastly, you can go to the “MyEUROPAGES” section where, as a member, you can have complete access to your account, including company information, advertisements, your buy & sell area, and your stats.
Switchboard Digital Directory
Switchboard.com is a digital directory, where you can search for various types of information. You can find a business by their name, location, or category. You can find a person using the White Pages, reverse phone search, or public records search. You can get maps and directions to any location. You can search for a phone number using a reverse address search or unlisted and cell phone number search. Finally you can find an area through a zip code lookup.
Yell
Yell.com is the UK’s online yellow pages. Directly from the homepage, you can search for a category, business name, or location. You can also use the map search to get directions, a bird’s eye view of a location, plot local businesses, and view draggable maps and speed cameras, all by simply inputting a location.