LibHunt tracks mentions of software libraries on relevant social networks. Based on that data, you can find the most popular projects and their alternatives.
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IBM Domino
Microsoft IIS
Apache Tomcat
LiteSpeed Web Server
Apache HTTP Server
Phusion Passenger
Eclipse Jetty
OpenResty
Forge
Apache Tomcat
Microsoft IIS
LiteSpeed Web Server
Apache HTTP Server
Phusion Passenger
Eclipse Jetty
OpenResty
IBM Domino ForgeMicrosoft IIS - Internet Information Services is a web server for Microsoft Windows
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
LiteSpeed Web Server - LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement.
Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
Phusion Passenger - Phusion Passenger is a multi-language (Ruby, Python, Node) web & app server which can integrate into Apache and Nginx
Eclipse Jetty - Jetty is a highly scalable modular servlet engine and http server that natively supports many modern protocols like SPDY and WebSockets.