• Advanced Message Queueing Protocol (AMQP)
• API Gateways
• Application Binary Interface (ABI) vs Application Programming Interface (API)
• Authentication - Authorization - Accounting - Auditing - Delegation - Consent
• Commenting／Comment Systems／Frameworks
• Data Storage
• Job Scheduler - Batch Scheduling
• Load Balancers／Balancing
• Publisher／Pub／Subscriber／Sub Messaging／Message Queues／System
• Search Engines (Index Servers - Search Servers)