Citrix NetScaler
43,573 websites

Citrix NetScaler offers both free and paid options

http://www.citrix.com/products/netscaler-application-delivery-controller/overview.html

Citrix NetScaler is an all-in-one web application delivery controller that makes applications run five times better, reduces web application ownership costs, and makes sure that applications are always available. It is deployed in thousand...

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Phusion Passenger
80,695 websites

Phusion Passenger offers both free and paid options

https://www.phusionpassenger.com

Phusion Passenger - a.k.a. mod_rails or mod_rack - is a web server and application server, designed to be fast, robust and lightweight. Administration tools allow you to gain insight into web application operations and server performance.

Market Share by Top Websites

1 Phusion Passenger is leading in Top 1M Sites and The Entire Web.

2 Citrix NetScaler is leading in Top 10K Sites and Top 100K Sites.

Websites Categories

1 Phusion Passenger has better usage coverage in more websites categories. Including Computers Electronics & Technology, Business & Consumer Services, Games, Arts & Entertainment and 16 other categories.

2 Citrix NetScaler is leading in Science & Education, Finance, Law & Government and Adult.

Geography

1 Phusion Passenger is leading in most countries, including United States, Canada, United Kingdom, Germany and 123 other countries.

2 Citrix NetScaler is leading in Japan, China, Turkey, Denmark and 25 other countries.