You can find lots of content related to DeltaSpike with a quick internet search. But here is a list of some useful articles and blogs to get you started.
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@DeltaSpikeTeam on Twitter
#deltaspike on Twitter
os890 DeltaSpike posts
Rafael Benevides DeltaSpike posts
RManiiBucau DeltaSpike posts
Struberg DeltaSpike posts
The Aquarium: Introducing DeltaSpike 1.0
DeltaSpike 1.0 – Extend #JavaEE beyond #JavaEE
Configuring Apache Deltaspike through environment variables
Bye Bye CDI Query, Hello DeltaSpike Data
DeltaSpike Data: repositories with DTOs!
Closing the Gaps: Introducing Apache Deltaspike
DeltaSpike JSF message system
Simplificando persistência de Dados com Apache DeltaSpike Data - PT-BR
Conhecendo Apache DeltaSpike: Configuration - PT-BR
Conhecendo Apache DeltaSpike: Injecting Resources - PT-BR