CDI is a JCP specification included in Java EE
Weld is the reference implementation of CDI
Seam 3 is a set of modules which extend CDI to provide functionality beyond that offered by Java EE 6
Think of JSR-299 as the core of Seam 3 - it's the basic programming model for your application components, and for the built-in components that make up the Seam framework
Seam 3 is implemented as a set of portable extensions, or modules
run in any environment which supports JSR-299 (including any Java EE 6 environment).
BPM integration, Seam Security, Drools integration, RESTeasy integration, PDF and email templates, Excel generation, etc
2.0.0.Final
End of 2012
Full specification compliance