There are numerous free listing sites and online directories where you can create listings for your business to increase online visibility. Here is a list of some popular free listing sites:

1. Google My Business: This is essential for local businesses. It helps your business appear in Google Maps and local search results.
2. Bing Places for Business: Similar to Google My Business, it’s important for local search on Bing.
3. Yelp: Yelp is a popular review site where users can find and review businesses in various categories.
4. Yellow Pages: The online version of the classic phone directory allows businesses to create a free listing.
5. Facebook Business Page: Create a business page on Facebook to connect with your audience and gain visibility.
6. LinkedIn Company Page: Especially important for B2B businesses, LinkedIn allows you to create a company page and showcase your services.
7. Apple Maps: If you have a physical location, you can add your business to Apple Maps through Apple’s Map Connect portal.
8. Yahoo Local: Yahoo offers a local listing service that can help your business be found by users on their platform.
9. Superpages: Superpages is an online directory where you can create a free listing.
10. Yellowbook: Yellowbook allows you to create a free business listing in their directory.
11. MerchantCircle: This platform connects local businesses with customers and allows you to create a free listing.
12. Hotfrog: Hotfrog is a business directory that provides free listings to businesses worldwide.
13. Manta: Manta is a small business directory where you can create a free business listing.
14. Angi: While primarily known for reviews, Angie’s List also allows businesses to create listings.
15. MapQuest: MapQuest offers business listings and maps services.
16. Citysearch: Citysearch is a local business directory where you can create a free listing.
17. Thumbtack: Thumbtack is a platform where you can create a free profile for your service-based business.
18. Local.com: Local.com is a local business directory that offers free listings.
19. Foursquare: Create a free listing on Foursquare to help users discover your business.
20. Chamber of Commerce Websites: Many local chambers of commerce have websites that allow businesses to create free listings.
21. BizJournals: Some cities have business journals or directories where you can create a free business listing.
22. ShowMeLocal: ShowMeLocal is a business directory that provides free listings.
23. EZ Local: EZ Local is an online directory where you can create a free listing.
24. Crunchbase: Particularly useful for startups and tech companies, Crunchbase allows businesses to create profiles.
25. Nextdoor: A platform where local businesses can create and manage their online profiles to connect with and engage their community of neighbors and potential customers.

Remember that while these listings are free, it’s important to keep your information accurate and up-to-date on all platforms. Additionally, the effectiveness of these listings can vary based on your industry, location, and how well you optimize your profiles for search.