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GNU Classpath is a free software implementation of the standard class library for the Java programming language.Most classes from J2SE 1.4 and 5.0 are implemented. Classpath can thus be used to run Java-based applications.
OpenJDK (Open Java Development Kit) is a free and open-source implementation of the Java Platform, Standard Edition (Java SE). [2] It is the result of an effort Sun Microsystems began in 2006, four years before the company was acquired by Oracle Corporation .
Free Java implementations are software projects that implement Oracle's Java technologies and are distributed under free software licences, making them free software. Sun released most of its Java source code as free software in May 2007, so it can now almost be considered a free Java implementation. [ 1 ]
IcedTea is a build and integration project for OpenJDK launched by Red Hat in June 2007. [3] IcedTea also includes some addon libraries: IcedTea-Web is a free software implementation of Java Web Start and the Java web browser applet plugin.
Apache Tomcat (called "Tomcat" for short) is a free and open-source implementation of the Jakarta Servlet, Jakarta Expression Language, and WebSocket technologies. It provides a "pure Java" HTTP web server environment in which Java code can also run. Thus it is a Java web application server, although not a full JEE application server.
Eclipse Adoptium originally started as AdoptOpenJDK. AdoptOpenJDK was founded in 2017 and provided enterprises with free and open-source Java runtimes. In 2020, AdoptOpenJDK moved to the Eclipse Foundation project under the name Eclipse Adoptium. The working group produces binaries via the Eclipse Temurin project.
Apache Harmony is a retired open source, free Java implementation, developed by the Apache Software Foundation. [1] It was announced in early May 2005 and on October 25, 2006, the board of directors voted to make Apache Harmony a top-level project.
Apache Lucene is a free and open-source search engine software library, originally written in Java by Doug Cutting. It is supported by the Apache Software Foundation and is released under the Apache Software License. Lucene is widely used as a standard foundation for production search applications. [2] [3] [4]