What message exchange systems do you use in your projects?

In projects for messaging, I used several systems depending on the task:

• RabbitMQ — for asynchronous task processing and integration between services.
• Kafka — for processing large streams of data and real-time events.
• Slack and Microsoft Teams — for team communication and notifications about testing statuses.

For example, in test automation through CI/CD pipeline, messages with test run results were sent to Slack at each stage, allowing quick response to errors.