Apache Hadoop

.NET is a free, open-source development platform for building many kinds of apps. With .NET, your code and project files look and feel the same no matter which type of app you're building. You have access to the same runtime, API, and language capabilities with each app.

.NET Framework (Classic) is the original .NET implementation that has existed since 2002. Versions 4.5 and later implement .NET Standard, so code that targets .NET Standard can run on those versions of .NET Framework. It contains additional Windows-specific APIs, such as APIs for Windows desktop development with Windows Forms and WPF. .NET Framework is optimized for building Windows desktop applications.

https://docs.microsoft.com/en-gb/dotnet/

Node.js® is a JavaScript runtime built on Chrome's V8 JavaScript engine.

Node.js is similar in design to, and influenced by, systems like Ruby's Event Machine and Python's Twisted. Node.js takes the event model a bit further. It presents an event loop as a runtime construct instead of as a library. In other systems, there is always a blocking call to start the event-loop. Typically, behavior is defined through callbacks at the beginning of a script, and at the end a server is started through a blocking call like EventMachine::run(). In Node.js, there is no such start-the-event-loop call. Node.js simply enters the event loop after executing the input script. Node.js exits the event loop when there are no more callbacks to perform. This behavior is like browser JavaScript — the event loop is hidden from the user.

HTTP is a first-class citizen in Node.js, designed with streaming and low latency in mind. This makes Node.js well suited for the foundation of a web library or framework.

Node.js being designed without threads doesn't mean you can't take advantage of multiple cores in your environment. Child processes can be spawned by using our child_process.fork() API, and are designed to be easy to communicate with. Built upon that same interface is the cluster module, which allows you to share sockets between processes to enable load balancing over your cores.

https://nodejs.org/en/

.NET is a free, open-source development platform for building many kinds of apps. With .NET, your code and project files look and feel the same no matter which type of app you're building. You have access to the same runtime, API, and language capabilities with each app.

.NET 5+, previously referred to as .NET Core, is a cross-platform implementation of .NET that's designed to handle server and cloud workloads at scale. It also supports other workloads, including desktop apps. It runs on Windows, macOS, and Linux. It implements .NET Standard, so code that targets .NET Standard can run on .NET 5+. ASP.NET Core, Windows Forms, and Windows Presentation Foundation (WPF) all run on .NET 5+.

.NET 6 is the latest version of this .NET implementation.

https://docs.microsoft.com/en-GB/dotnet/

ASP.NET 4.x is a mature framework that provides the services needed to build enterprise-grade, server-based web apps on Windows.

ASP.NET 4.x has the following features:

• Build for Windows
• Use Web Forms, SignalR, MVC, Web API, WebHooks, or Web Pages
• One version per machine
• Develop with Visual Studio using C#, VB, or F#
• Good performance
• Use .NET Framework runtime

https://docs.microsoft.com/en-us/aspnet/core/fundamentals/choose-aspnet-framework?view=aspnetcore-6.0

ASP.NET Core is a cross-platform, high-performance, open-source framework for building modern, cloud-enabled, Internet-connected apps.

ASP.NET Core has the following features:

• Build for Windows, macOS, or Linux
• Razor Pages is the recommended approach to create a Web UI as of ASP.NET Core 2.x. See also MVC, Web API, and SignalR
• Multiple versions per machine
• Develop with Visual Studio, Visual Studio for Mac, or Visual Studio Code using C# or F#
• Higher performance than ASP.NET 4.x
• Use .NET Core runtime

https://docs.microsoft.com/en-GB/aspnet/core/?view=aspnetcore-6.0

Blockchain is a shared, immutable ledger that facilitates the process of recording transactions and tracking assets in a business network. An asset can be tangible (a house, car, cash, land) or intangible (intellectual property, patents, copyrights, branding). Virtually anything of value can be tracked and traded on a blockchain network, reducing risk and cutting costs for all involved.

https://www.ibm.com/topics/what-is-blockchain

Amazon DocumentDB (with MongoDB compatibility) is a fast, reliable, and fully managed database service. Amazon DocumentDB makes it easy to set up, operate, and scale MongoDB-compatible databases in the cloud. With Amazon DocumentDB, you can run the same application code and use the same drivers and tools that you use with MongoDB.

The following are some high-level features of Amazon DocumentDB:

• Amazon DocumentDB automatically grows the size of your storage volume as your database storage needs grow. Your storage volume grows in increments of 10 GB, up to a maximum of 64 TiB. You don't need to provision any excess storage for your cluster to handle future growth.
• With Amazon DocumentDB, you can increase read throughput to support high-volume application requests by creating up to 15 replica instances. Amazon DocumentDB replicas share the same underlying storage, lowering costs and avoiding the need to perform writes at the replica nodes. This capability frees up more processing power to serve read requests and reduces the replica lag time—often down to single digit milliseconds. You can add replicas in minutes regardless of the storage volume size. Amazon DocumentDB also provides a reader endpoint, so the application can connect without having to track replicas as they are added and removed.
• Amazon DocumentDB lets you scale the compute and memory resources for each of your instances up or down. Compute scaling operations typically complete in a few minutes.
• Amazon DocumentDB runs in Amazon Virtual Private Cloud (Amazon VPC), so you can isolate your database in your own virtual network. You can also configure firewall settings to control network access to your cluster.
• Amazon DocumentDB continuously monitors the health of your cluster. On an instance failure, Amazon DocumentDB automatically restarts the instance and associated processes. Amazon DocumentDB doesn't require a crash recovery replay of database redo logs, which greatly reduces restart times. Amazon DocumentDB also isolates the database cache from the database process, enabling the cache to survive an instance restart.
• On instance failure, Amazon DocumentDB automates failover to one of up to 15 Amazon DocumentDB replicas that you create in other Availability Zones. If no replicas have been provisioned and a failure occurs, Amazon DocumentDB tries to create a new Amazon DocumentDB instance automatically.
• The backup capability in Amazon DocumentDB enables point-in-time recovery for your cluster. This feature allows you to restore your cluster to any second during your retention period, up to the last 5 minutes. You can configure your automatic backup retention period up to 35 days. Automated backups are stored in Amazon Simple Storage Service (Amazon S3), which is designed for 99.999999999% durability. Amazon DocumentDB backups are automatic, incremental, and continuous, and they have no impact on your cluster performance.
• With Amazon DocumentDB, you can encrypt your databases using keys that you create and control through AWS Key Management Service (AWS KMS). On a database cluster running with Amazon DocumentDB encryption, data stored at rest in the underlying storage is encrypted. The automated backups, snapshots, and replicas in the same cluster are also encrypted.

https://aws.amazon.com/documentdb/

Express is a minimal and flexible Node.js web application framework that provides a robust set of features for web and mobile applications. With a myriad of HTTP utility methods and middleware at your disposal, creating a robust API is quick and easy. Express provides a thin layer of fundamental web application features, without obscuring Node.js features that you know and love. Many popular frameworks are based on Express.

https://expressjs.com/

Spring Boot is a framework that allows to easily create Spring-powered, production-grade applications and services with the absolute minimum fuss. It takes an opinionated view of the Spring platform designed to work for new and experienced users of Spring.

https://spring.io/