What are the differences between the various packages of Eclipse IDE?

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These packages are provided as a convenience to users; they represent common configurations of Eclipse projects that are often used together. However, since Eclipse is, at its core, an expandable platform, you can easily add other features and plugins to any of these packages. Just choose and install the package that most closely meets your needs, then follow these instructions to add features that you need.
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Read more, http://www.eclipse.org/downloads/compare.php

What is EasyEclipse?

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EasyEclipse is an open source software project hosted in Sourceforge that provides several bundled distributions of the Eclipse IDE pre configured with plug-ins for special purposes such as Python programming, Ruby on Rails, etc. It is released under CPL,EPL and OSL.[1]-----
copied from: http://en.wikipedia.org/wiki/EasyEclipse

What is Eclipse IDE?

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In computer programming, Eclipse is an integrated development environment (IDE). It contains a base workspaceand an extensible plug-in system for customizing the environment. Written mostly in Java, Eclipse can be used to develop applications. By means of various plug-ins, Eclipse may also be used to develop applications in otherprogramming languages: Ada, ABAP, C, C++, COBOL, Fortran, Haskell, JavaScript,Lasso, Natural, Perl, PHP,Python, R, Ruby (including Ruby on Rails framework), Scala,Clojure, Groovy, Scheme, and Erlang. It can also be used to develop packages for the software Mathematica. Development environments include the Eclipse Java development tools (JDT) for Java and Scala, Eclipse CDT for C/C++ and Eclipse PDT for PHP, among others.

The initial codebase originated from IBM VisualAge.[2] The Eclipse software development kit (SDK), which includes the Java development tools, is meant for Java developers. Users can extend its abilities by installing plug-ins written for the Eclipse Platform, such as development toolkits for other programming languages, and can write and contribute their own plug-in modules.

Released under the terms of the Eclipse Public License, Eclipse SDK is free and open source software (although it is incompatible with the GNU General Public License[3]). It was one of the first IDEs to run under GNU Classpathand it runs without problems underIcedTea.
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copied from: http://en.wikipedia.org/wiki/Eclipse_(software)