Kafdrop is a web UI for viewing Kafka topics and browsing consumer groups. The tool displays information such as brokers, topics, partitions, consumers, and lets you view messages.

Kafdrop – Kafka Web UI

A CQRS (Command Query Responsibility Segregation) Framework for Scalable, High-Performance Java Applications. 
Axon decouples application components to enable linear dynamic scaling. Logical components are separated within your architecture in a service oriented manner, and coupled using an asynchronous message bus. This enables components to be physically spread amongst different servers and hereby realizing linear scaling.
 
Axon Framework helps build scalable, extensible and maintainable applications by supporting developers apply the Command Query Responsibility Segregation (CQRS) architectural pattern. It does so by providing implementations of the most important building blocks, such as aggregates, repositories and event buses (the dispatching mechanism for events). Furthermore, Axon provides annotation support, which allows you to build aggregates and event listeners without tying your code to Axon specific logic. This allows you to focus on your business logic, instead of the plumbing, and helps you to make your code easier to test in isolation.
 
Axon does not, in any way, try to hide the CQRS architecture or any of its components from developers. Therefore, depending on team size, it is still advisable to have one or more developers with a thorough understanding of CQRS on each team. However, Axon does help when it comes to guaranteeing delivering events to the right event listeners and processing them concurrently and in the correct order. These multi-threading concerns are typically hard to deal with, leading to hard-to-trace bugs and sometimes complete application failure. When you have a tight deadline, you probably don’t even want to care about these concerns. Axon’s code is thoroughly tested to prevent these types of bugs.

A CQRS (Command Query Responsibility Segregation) Framework for Scalable, High-Performance Java Applications. 

AxonFramework - High Performance and Scalability framework for Java

ZITADEL provides you with all the features necessary to build great solutions, without the need of building the login and access management yourself. 
 
Its features include: 
<ul><li>Authentication:&nbsp; OpenID Connect 1.0 Protocol (OP), Username / Password,&nbsp; Machine-to-machine (JWT profile), Passwordless with FIDO2</li><li>Multifactor authentication with OTP, U2F</li><li>Federation with OpenID Connect 1.0 Protocol (RP), OAuth 2.0 Protocol (RP)</li><li>Authorization via Role Based Access Control (RBAC)</li><li>Identity Brokering</li><li>Delegation of roles to other organizations for self-management</li><li>Strong audit trail for all IAM resources</li><li>User interface for administration</li><li>APIs for Management, Administration, and Authentication</li><li>Policy configuration and enforcement</li><li>Private Labeling</li></ul>

ZITADEL provides you with all the features necessary to build great solutions, without the need of building the login and access management yourself. 

ZITADEL - Cloud Native Identity and Access Management

PumpkinDB is a event sourcing database engine that doesn't overwrite data. It features include Immutable key/value storage, ACID transactions, Binary keys and values (allows any encoding to be used: JSON, XML, Protobuf, Cap'n Proto, etc.), An embedded programming language (PumpkinScript), A range of event indexing and querying primitives.
 
The core ideas behind PumpkinDB stem from the so called lazy event sourcing approach which is based on storing and indexing events while delaying domain binding for as long as possible. That said, the intention of this database is to be a building block for different kinds of event sourcing systems, ranging from the classic one (using it as an event store) all the way to the lazy one (using indices) and anywhere in between. It's also possible to implement different approaches within a single database for different parts of the domain.

PumpkinDB is a event sourcing database engine that doesn't overwrite data. It features include Immutable key/value storage, ACID transactions, Binary keys and values (allows any encoding to be used: JSON, XML, Protobuf, Cap'n Proto, etc.), An embedded programming language (PumpkinScript), A range of event indexing and querying primitives.

PumpkinDB - Event Sourcing Database Engine

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Kafdrop – Kafka Web UI

AxonFramework - High Performance and Scalability framework for Java

ZITADEL - Cloud Native Identity and Access Management

PumpkinDB - Event Sourcing Database Engine

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Kafdrop – Kafka Web UI

AxonFramework - High Performance and Scalability framework for Java

ZITADEL - Cloud Native Identity and Access Management

PumpkinDB - Event Sourcing Database Engine

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