Kentico
10,715 websites

Kentico offers both free and paid options

http://www.kentico.com/

Kentico CMS for ASP.NET gives marketers and developers the ability to create websites. A solution for website, store, community and on-line marketing initiatives.

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Zendesk Knowledge Base
19,041 websites

Zendesk Knowledge Base costs money

https://www.zendesk.com/guide/features/knowledge-base-software/

Zendesk Knowledge Base allows you to create, organize, and share content easily with agents, select customers, or the public and measure what performs best.

Market Share by Top Websites

1 Zendesk Knowledge Base is leading in The Entire Web.

2 Kentico is leading in Top 10K Sites, Top 100K Sites and Top 1M Sites.

Websites Categories

1 Zendesk Knowledge Base has better usage coverage in more websites categories. Including Computers Electronics & Technology, Finance, Business & Consumer Services, Lifestyle and 18 other categories.

2 Kentico is leading in Law & Government and Heavy Industry & Engineering.

Geography

1 Zendesk Knowledge Base is leading in most countries, including United States, United Kingdom, Japan, Germany and 97 other countries.

2 Kentico is leading in Canada, Czech Republic, Italy, South Africa and 29 other countries.