“openjdk-6” package in Ubuntu

 icedtea-6-jre-cacao: Alternative JVM for OpenJDK, using Cacao

icedtea-6-jre-jamvm: Alternative JVM for OpenJDK, using JamVM
openjdk-6-dbg: Java runtime based on OpenJDK (debugging symbols)
openjdk-6-demo: Java runtime based on OpenJDK (demos and examples)
openjdk-6-doc: OpenJDK Development Kit (JDK) documentation
openjdk-6-jdk: OpenJDK Development Kit (JDK)
openjdk-6-jre: OpenJDK Java runtime, using Hotspot Zero
openjdk-6-jre-headless: OpenJDK Java runtime, using Hotspot Zero (headless)
openjdk-6-jre-lib: OpenJDK Java runtime (architecture independent libraries)
openjdk-6-jre-zero: Alternative JVM for OpenJDK, using Zero/Shark
openjdk-6-source: OpenJDK Development Kit (JDK) source files

https://launchpad.net/ubuntu/+source/openjdk-6

ps:

How to download and install prebuilt OpenJDK packages

JDK 7

Debian, Ubuntu, etc.

On the command line, type:

$ sudo apt-get install openjdk-7-jre

The openjdk-7-jre package contains just the Java Runtime Environment. If you want to develop Java programs then install the openjdk-7-jdk package.

Fedora, Oracle Linux, Red Hat Enterprise Linux, etc.

On the command line, type:

$ su -c "yum install java-1.7.0-openjdk"

The java-1.7.0-openjdk package contains just the Java Runtime Environment. If you want to develop Java programs then install the java-1.7.0-openjdk-devel package.

JDK 6

Debian, Ubuntu, etc.

On the command line, type:

$ sudo apt-get install openjdk-6-jre

The openjdk-6-jre package contains just the Java Runtime Environment. If you want to develop Java programs then install the openjdk-6-jdk package.

Fedora, Oracle Linux, Red Hat Enterprise Linux, etc.

On the command line, type:

$ su -c "yum install java-1.6.0-openjdk"

The java-1.6.0-openjdk package contains just the Java Runtime Environment. If you want to develop Java programs then install the java-1.6.0-openjdk-devel package.

BSD Port

For a list of pointers to packages of the BSD Port for DragonFly BSD, FreeBSD, Mac OS X, NetBSD and OpenBSD, please see the BSD porting Project's wiki page.