Windows Workflow Foundation (outdated .Net 4.5)

Windows Workflow Foundation outdated with .Net 4.5 (2013)

https://blog.inedo.com/dotnet/windows-workflow-foundation/

There is no full port to .Net Core of WWF, but a partial port at your won risk and alternatives to WWF.

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CoreWF

A port of the Windows Workflow Foundation (WF) runtime to .NET 6. It is licensed under the MIT License.
https://github.com/UiPath/CoreWF

This is not an official Microsoft release of WF on .NET 6. CoreWF is a derivative work of Microsoft's copyrighted Windows Workflow Foundation.

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Building Workflow with .NET Core:
Benefits & Limitations

https://www.nected.ai/blog/dot-net-workflow-core

app.nected.ai

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Netflix Conductor

Workflow Creation in Code

Conductor supports creating workflows using JSON and Code.

SDK support for creating workflows using code is available in multiple languages and can be found at https://github.com/conductor-sdk

https://netflixtechblog.com/netflix-conductor-a-microservices-orchestrator-2e8d4771bf40

https://github.com/Netflix/conductor

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Workflow Engine 

Lowcode platform for .Net

https://workflowengine.io/blog/alternative-to-windows-workflow-foundation/

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Other products

https://decisions.com/
https://kissflow.com/workflow