Here are the plug-ins you can install for Eclipse
1. EasyExplorer
Introduction: If you often need to open the relevant resource files in Eclipse folder, more trouble, to right-click, properties, in the Location column in the folder to copy a bit, and then go to the Explorer to enter the path, return, and then open it, more trouble. Easy Explorer is an Eclipse widget that directly opens the directory where the selected files are located.
Official website: http://sourceforge.net/projects/easystruts/
2.FINDBUGS
Introduction: FindBugs is a static analysis tool that examines a class or JAR file and compares the bytecode to a set of defect patterns to identify possible problems. A static analysis tool, you can analyze the software without actually running the program. It can help improve the quality of your code. It is looking for code flaws, a lot of the bad places we write, can optimize the place, it can be checked out. For example: Database connection not closed, missing necessary null check, extra null check, redundant if post condition, same conditional branch, duplicate code block, wrong use of "= =", Comparison of different data types, It is recommended to use StringBuffer instead of strings to add and so on.
official website: http://findbugs.sourceforge.net/
3.SPKET 
Introduction: Spket The IDE is a powerful JavaScript and XML Development toolkit. This powerful editor can be used for JavaScript, XUL/XBL and Yahoo! Widget development. JavaScript editors have features such as code completion, syntax tagging, and content overview to help developers create efficient JavaScript code.
official website: http://www.spket.com
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4. jadclipse---------This plugin really good, who use who know
Description: Jadclipse is an eclipse plugin that seamlessly integrates the Jad (Fast Java anti-compiler) with Eclipse. Typically, when you open a class file, the class file viewer displays a brief outline of the API class. If you install this plugin, the Jadclipse class file viewer replaces the class file viewer and displays the anti-compilation source code for the class. This task can be done by using Jad in the background to decompile the corresponding class file. can support normal Java syntax highlighting and outline view.
official website: http://sourceforge.net/projects/jadclipse/
5.properties editor
Introduction: Properties Editor edits Java property files and can be automatically saved to Unicode format.
official website: http://propedit.sourceforge.jp/index_en.html
6.subclipse--svn plug-in, preferably installed in the form of install new software. subclipse,svnkit installation
Description: Subclipse is a project that adds Subversion support to the Eclipse IDE. Support for almost all versions of Eclipse.
official website: http://subclipse.stage.tigris.org/
Eclipse Common Plugins