​Oracle
If you do not already have access to the Oracle database software or the Oracle SQL Developer tool, you may download it directly from Oracle’s Web site. 
 
     Download Oracle’s database software
     Download SQL Developer
 
To access Oracle’s main site, read the on-line documentation, or review the Oracle support forums, use the following links:
 
     Link to Oracle’s  Web sites
     Oracle Documentation
     Oracle Technology Network (OTN)
 
 
Oracle User Groups
Whether you are new to Oracle or a seasoned professional, there is always much to learn by joining a user group.  Locate your nearest Oracle community:
 
     Oracle User Group Center
     International Oracle Users Group (IOUG)