Official Hyperledger Fabric blockchain documentation.  It includes getting started doc, Concepts, Tutorials, Architecture, and Troubleshooting FAQ: http://hyperledger-fabric.readthedocs.io/en/latest/blockchain.html

Official Hyperledger Composer documentation. It includes key concepts, installation steps, tutorials and development guidelines: https://hyperledger.github.io/composer/introduction/introduction.html

Hyperledger Fabric repo: https://github.com/hyperledger/fabric

Hyperledger Fabric Client SDK for Node.js: https://github.com/hyperledger/fabric-sdk-node

Hyperledger Composer online playground: https://composer-playground.mybluemix.net/

IBM Marbles Demo app repo (using native Chaincode development with Golang): https://github.com/IBM-Blockchain/marbles

IBM Blockchain foundational presentations (blockchain concepts, architecture, solutions, intro to HyperLedger): https://ibm.ent.box.com/v/BlockFiles/folder/19907051601

IBM Blockchain Labs presentations (sample applications): https://ibm.ent.box.com/v/BlockFiles/folder/19907055550

IBM Decentralized-Energy Demo app repo (using Composer development with Javascript): https://github.com/IBM/Decentralized-Energy-Composer

IBM Bluemix Blockchain resource: https://console.bluemix.net/docs/services/blockchain/ibmblockchain_tutorials.html

Hyperledger Fabric Explainer Video: https://www.youtube.com/watch?v=js3Zjxbo8TM

Hyperledger Composer Introductory Video: https://www.youtube.com/watch?v=fdFUsrsv5iw

Benefits of using Hyperledger Composer Video: https://www.youtube.com/watch?v=HvUQllIR_s4

Slides: Technical introduction to Hyperledger Fabric v1.0 architecture: https://www.slideshare.net/altoros/technical-introduction-to-hyperledger-fabric-v10

Rocket chat, an online resource for posting and answering questions: https://chat.hyperledger.org