Glassfish Community Edition is free and powerful (Full Java EE 6 platform support).
GlassFish Server Open Source Edition
Free community-supported application server
Full Java EE 6 platform support
The best open source application server in the industry today
Next-generation modular and extensible architecture (OSGi)
Enterprise reliability and performance with full clustering
JBoss Community Server is also free but JBoss Enterprise is not.
It is free for commercial use. You can develop your applications and deploy them in production environment on top of JBoss without having to pay anything.
Here is the feature differences of two edition:
Both of this solutions offer enterprise level support with a fee.
Jboss and Glassfish are great examples of application servers free for commercial use, you have to distinguish the difference between free use and support, both of them are free to use but if you want to get same support (not talking here about forums etc) you would have to probably pay for it.
从 8.5.5.6 开始，WebSphere Liberty Profile 是完全 Java EE 7 应用程序服务器。它可免费用于开发和生产使用，但有一定限制（每个使用组织 2GB RAM）。有关更多详细信息，请查看 websphere-application-server-everyone
WebSphere Liberty Profile starting from 8.5.5.6 is fully Java EE 7 application server. It is free for development and for production usage with certain restrictions (2GB RAM per using organization). For more details check websphere-application-server-everyone
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Glassfish 社区版免费且功能强大（完整的 Java EE 6 平台支持）。
GlassFish Server 开源版
JBoss Community Server 也是免费的，但 JBoss Enterprise 则不然。
它可以免费用于商业用途。您可以开发应用程序并将其部署在 JBoss 之上的生产环境中，而无需支付任何费用。
这是两个版本的功能差异：
这两个版本解决方案提供收费的企业级支持。
Glassfish Community Edition is free and powerful (Full Java EE 6 platform support).
GlassFish Server Open Source Edition
JBoss Community Server is also free but JBoss Enterprise is not.
It is free for commercial use. You can develop your applications and deploy them in production environment on top of JBoss without having to pay anything.
Here is the feature differences of two edition:
Both of this solutions offer enterprise level support with a fee.
Jboss和Glassfish是免费用于商业用途的应用程序服务器的很好的例子，你必须区分免费使用和支持之间的区别，它们都是免费使用的，但如果你想获得相同的支持（这里不是谈论论坛等）你可能必须为此付出代价。
Jboss and Glassfish are great examples of application servers free for commercial use, you have to distinguish the difference between free use and support, both of them are free to use but if you want to get same support (not talking here about forums etc) you would have to probably pay for it.
如果它是免费的，那么为什么 Jboss 明确声明“下载仅供开发使用 “？！
If it is free, then why Jboss clearly states that "downloads are for development use only"?!
从 8.5.5.6 开始，WebSphere Liberty Profile 是完全 Java EE 7 应用程序服务器。它可免费用于开发和生产使用，但有一定限制（每个使用组织 2GB RAM）。有关更多详细信息，请查看 websphere-application-server-everyone
WebSphere Liberty Profile starting from 8.5.5.6 is fully Java EE 7 application server. It is free for development and for production usage with certain restrictions (2GB RAM per using organization). For more details check websphere-application-server-everyone
JBoss 也是免费的（我们正在使用它）。
JBoss is free too (we are using it).