Sonargraph-Explorer: our low cost entry level product for dependency visualization and gathering of basic metrics.
Sonargraph-Architect: this is our main product that allows you to enforce quality models and architectural rules over the lifetime of your system. In contrast to Sonargraph-Explorer it not only assesses and visualizes issues, but also allows you to manage them.
Sonargraph-Developer: this product comprises a read-only version of Sonargraph-Architect and our IDE plugins for Eclipse and IntelliJ-IDEA. Usually this is not licensed separately anymore, because you get all the benefits for all users with a team license.
Sonargraph-Build (Explorer variant): Explorer version of our build integration. Works with your explorer license.
Sonargraph-Build (Architect variant): advanced build integration.

Here is the detailed feature matrix:

	Explorer	Architect	Developer	Build Explorer	Build Architect
Dependency Visualization	X	X
Cycle Visualization	X	X
Basic Metrics	X	X		X	X
Metric Thresholds	X	X		X	X
Architecture DSL		X			X
Issue Management		X			X
Duplicate Code Checker		X			X
Cycle Breakup Analyzer		X
Virtual Refactorings		X			X
Advanced Metrics		X			X
Scripting Engine (Groovy)		X			X
Enhanced Quality Models		X			X
Baselines		X			X
Quality Gates		X			X
Change History Metrics		X			X
Treemaps		X
ANT Task				X	X
Maven Plugin				X	X
Gradle Plugin				X	X
Jenkins Plugin				X	X
SonarQube Plugin				X	X
Eclipse Plugin (Java)		X	X
IntelliJ Plugin (Java)		X	X
Read-Only Sonargraph-Architect			X