RabbitMQ

Zigbee2MQTT is an open-source Zigbee-to-MQTT bridge developed in the Koenkk project, allowing Zigbee devices to operate without their vendor-specific bridge or gateway. It uses zigbee-herdsman to communicate with a hardware adapter, zigbee-herdsman-converters to map device models to supported Zigbee clusters, and the Zigbee2MQTT module to translate Zigbee messages into MQTT messages while tracking device state in a JSON database. It provides web interfaces for monitoring and configuration and can integrate with home-automation systems such as Home Assistant, Homey, Domoticz, Gladys Assistant, and ioBroker.

Apache Kafka is an open-source distributed event-streaming platform developed by the Apache Software Foundation. It is used for high-performance data pipelines, streaming analytics, data integration, and mission-critical applications, and can be deployed on premises, in a cluster, or through a managed service. The official repository contains Java and Scala source code, build tasks, documentation generation, and unit and integration tests.

Sockudo is a self-hosted, high-performance Rust real-time server for WebSocket and HTTP publishing. It targets strict Pusher Protocol V1 compatibility for drop-in use, while Protocol V2 adds Sockudo-native events, serials, message IDs, recovery, rewind, tags, deltas, annotations, and mutable message events. The platform supports durable history, hot replay buffers, two-tier recovery, presence history, push notifications, webhooks, rate limiting, TLS, Prometheus metrics, Docker Compose, and Helm. Horizontal fanout can use Redis, Redis Cluster, NATS, RabbitMQ, Google Pub/Sub, Kafka, Pulsar, or Apache Iggy. The monorepo includes the Rust server and workspace crates, dashboards, deployment assets, documentation, official real-time and server SDKs, and an optional AI Transport SDK.

Booking Microservices is a practical flight-booking system developed by Evangelos Vlachos as a set of .NET 10 microservices. It uses Vertical Slice Architecture, domain-driven design, CQRS, and event sourcing; commands update PostgreSQL or EventStoreDB and publish integration events through Wolverine's durable outbox to RabbitMQ, while consumers use a durable inbox to project read models into MongoDB. Queries read from MongoDB, and synchronous cross-service validation uses gRPC. The repository includes Identity, Flight, Passenger, Booking, and YARP API gateway services, plus .NET Aspire orchestration, Docker Compose and Kubernetes deployment configurations, OpenTelemetry-based observability, OpenAPI documentation, and automated unit, integration, end-to-end, and contract tests.

Redis is an open-source in-memory data structure server, cache, key-value and document database, and query engine for real-time applications. It supports strings, lists, sets, hashes, sorted sets, JSON, time-series data, transactions, scripting, queues, streams, publish/subscribe messaging, full-text and geospatial queries, aggregations, and vector search. The project is used for caching, distributed session storage, event brokering, real-time analytics, and as a supporting service for the support desk shown in the video.