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The following plugins are the standard plugins for Maven2:
Verification & validation
Animal Sniffer Maven Plugin - Verify your project against signatures.
Animal Sniffer Enforcer Rule - Verify your project against signatures.
Checkstyle Plugin - Generate a checkstyle report.
Clirr Plugin - Check Java libraries for binary and source compatibility with older releases.
Clover Plugin - Generate a Clover report.
Cobertura Plugin - Generate a Cobertura report of code coverage and complexity.
Documentation Checker Plugin - Check plugin site for conformance with plugin documentation standard.
FindBugs Plugin - Check for various bugs in Java source code.
Surefire Plugin - Run the unit tests in an isolated classloader.
Surefire Report Plugin - Integrate unit test results into the project site.
PMD Plugin - Generate a PMD report.
Verifier Plugin - Useful for integration tests - verifies the existence of certain conditions.
Construction & generation
Ant Plugin - Generate an Ant build file for the project.
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Castor Plugin - Generates Java beans from XML schemas using Castor XML code generator.
Changelog Plugin - Generate a SCM change log.
Changes Plugin - Generate a release history from a handcrafted changes report.
Checkstyle Plugin - Generate a checkstyle report.
Clean Plugin - Clean up after the build.
Clirr Plugin - Check Java libraries for binary and source compatibility with older releases.
Clover Plugin - Generate a Clover report.
Cobertura Plugin - Generate a Cobertura report of code coverage and complexity.
Compiler Plugin - Compiles Java sources.
Dashboard Plugin - Aggregates Cobertura/Surefire/Checkstyle/PMD/CPD Reports.
DBUnit Plugin - Puts a database into a known state between test runs.
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DOAP Plugin - Generate DOAP info file from the POM.
Docbkx Maven Plugin - Build documentation from DocBook sources.
Documentation Checker Plugin - Check plugin site for conformance with plugin documentation standard.
EAR Plugin - Generate an EAR from the current project.
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Enforcer Plugin - Check build constraints like Maven or Java version.
FindBugs Plugin - Check for various bugs in Java source code.
GPG Plugin - Sign artifacts using GnuPG.
Help Plugin - Get information about the working environment for the project.
IDEA Plugin - Create/update an IDEA workspace for the current project (individual modules are created as IDEA modules).
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Patch Plugin - Apply patch files to the project source tree.
PDF Plugin - Generate PDF documents from site sources.
Plugin Plugin - Create a Maven plugin descriptor for any Mojo's found in the source tree, to include in the JAR.
PMD Plugin - Generate a PMD report.
Project Info Reports Plugin - Generate a standard project reports.
RAR Plugin - Build a RAR from the current project.
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SQL Plugin - Execute SQL statements.
Surefire Plugin - Run the unit tests in an isolated classloader.
Surefire Report Plugin - Integrate unit test results into the project site.
Verifier Plugin - Useful for integration tests - verifies the existence of certain conditions.
Versions Plugin - Manage the versions of artifacts in a project's POM.
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XSLT Plugin - Run XSL Transformations.
Documentation
Changes Plugin - Generate a release history from a handcrafted changes report.
Changelog Plugin - Generate a SCM change log.
Dashboard Plugin - Aggregates Cobertura/Surefire/Checkstyle/PMD/CPD Reports.
Docbkx Maven Plugin - Build documentation from DocBook sources.
Help Plugin - Get information about the working environment for the project.
Project Info Reports Plugin - Generate a standard project reports.
PDF Plugin - Generate PDF documents from site sources.