java的开源框架集合
http://www.open-open.com/
ibm超级强大的技术社区
http://www.ibm.com/developerworks/cn/
超级强大的前台效果代码下载站
http://www.dynamicdrive.com/
maven中央库
http://search.maven.org/#browse
codeproject http://www.codeproject.com/
opensource http://www.opensource.org/
java.net http://www.java.net/
XmlBuddy http://www.xmlbuddy.com/(XML Editor plugin for Eclipse)
JFreeChart http://www.jfree.org/(用于生成图表的项目)
EclipseMEhttp://eclipseme.sourceforge.net/(J2ME Developmnt Plugin for Eclipse)
jChatBox http://www.javazoom.net/index.shtml(用servlet实现的WEB聊天引擎)
POI http://jakarta.apache.org/poi/index.html(用于处理Excel,WORD等文档的项目)
FileUpload http://jakarta.apache.org/commons/fileupload/(用于处理HTTP文件上传得项目)
PDFBox http://sourceforge.net/projects/pdfbox/(处理PDF文档的项目)
Lucene http://jakarta.apache.org/lucene/index.html(搜索引擎)
Digester http://jakarta.apache.org/commons/digester/(处理XML信息的项目)
DBCP http://jakarta.apache.org/commons/dbcp/ (数据库连接池)
AXIS http://ws.apache.org/axis/(WebService 的实现框架)
Jetspeed http://portals.apache.org/jetspeed-1/(Portal)
HSQLDB http://sourceforge.net/projects/hsqldb/(Im memory Database Engine)
CEWOLF http://sourceforge.net/projects/cewolf/ (一套标签库实现Web报表,使用的是jFreeChart引擎)
htmlparser http://sourceforge.net/projects/htmlparser/ (用于解析HTML信息的项目)
http://java-source.net/