Apache James

Apache James is a pure Java SMTP, POP3 enterprise mail server.

14 Alternatives To Apache James

263 Mail

263 Mail is an email solution for the enterprises.

Apache Tomcat

An open source software implementation of the Java Servlet and JavaServer Pages technologies

FastMail

Email, calendars, and contacts to highest standards of security, privacy and reliability.
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LiteSpeed Web Server

LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement.

OpenResty

Turning Nginx into a Full-fledged Web App Server

Oracle Tuxedo

Oracle Tuxedo is an application server for C, C++, COBOL, Java and dynamic language applications in private cloud or traditional data center environments.

Oracle WebLogic

Receive a complimentary technical review and consultation on moving your Oracle WebLogic Server applications into containers.
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Payara Server

Payara Server is fully supported, developer-friendly, open source application server. Innovative, cloud-native, optimized for production deployments.
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ProtonMail

Secure email with absolutely no compromises. Get your free encrypted email account today.

QQ Mail

QQ Mail is an enterprise email solution from Tencent.

Tornado

A Python web framework and asynchronous networking library, originally developed at FriendFeed

Wildfly

WildFly is a flexible, lightweight application server.
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Zoho Mail

Zoho Mail is a webmail service built with the needs of a modern business in mind.

lighttpd

A secure, fast, compliant, and very flexible web-server that has been optimized for high-performance environments