Bugs, feature requests and tickets:

• https://jira.atlassian.com/browse/CLOV - bug tracking / feature requests
• https://support.atlassian.com/ja - Atlassian Support, the "Clover Support" project

Product documentation:

• https://confluence.atlassian.com/display/CLOVER - end-user documentation
• https://confluence.atlassian.com/display/CLOVERKB - Knowledge Base (for end-users and for Hercules bot)
• https://confluence.atlassian.com/display/BAMBOO/Enabling+the+Clover+add-on - Bamboo Clover Plugin
  
• http://wiki.hudson-ci.org/display/HUDSON/Clover+Plugin - Hudson Clover Plugin
• https://wiki.jenkins-ci.org/display/JENKINS/Clover+Plugin - Jenkins Clover Plugin
• https://developer.ibm.com/urbancode/plugin/clover/ - AnthillPro plugin

Generated documentation

• https://docs.atlassian.com 
  • 'clover-maven-plugin' (plugin site documentation) and
  • 'atlassian-clover' (API JavaDocs)

Source code repositories

• https://bitbucket.org/atlassian/clover - Clover Core, Clover-for-Ant, Clover-for-Eclipse, Clover-for-IDEA
  
• https://bitbucket.org/atlassian/clover-aspectj-compiler - Clover extension for AspectJ compiler
• https://bitbucket.org/atlassian/maven-clover2-plugin - Clover-for-Maven 2&3
• https://bitbucket.org/atlassian/grails-clover-plugin  - Clover-for-Grails
  
• https://bitbucket.org/atlassian/gradle-clover-plugin - Gradle Clover Plugin written by Atlassian
• https://github.com/bmuschko/gradle-clover-plugin -  Gradle Clover Plugin written by Benjamin Muschko
  
• https://github.com/hudson2-plugins/clover-plugin - Hudson 2.x Clover Plugin
• https://github.com/hudson3-plugins/clover-plugin - Hudson 3.x Clover Plugin
• https://github.com/jenkinsci/clover-plugin - Jenkins Clover Plugin
• https://github.com/SonarQubeCommunity/sonar-clover - Sonar Clover Plugin
  
  

Other sites:

• https://plugins.jetbrains.com/plugin/?id=132 - Clover for IDEA plugin site
• https://marketplace.eclipse.org/content/atlassian-clover-eclipse - Eclipse Marketplace
• https://twitter.com/cloverallover - unofficial Clover tweet, used to inform about new releases, manuals etc