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Jint https://github.com/sebastienros/jint
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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ClearScript
A library for adding scripting to .NET applications. Supports V8 (Windows, Linux, macOS) and JScript/VBScript (Windows).
I've used ClearScript before to use JavaScript as a DSL in a tool. No issues at all. https://github.com/microsoft/ClearScript
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I dont want to state the obvious but of course there is CefSharp .. But of course thats pretty heavy duty as you end shipping a headless version of Chrome in your app, but it can do anything a browser can do (of course it can, its Chrome), including exectuting a JavaScript string on the fly and getting a response. Because its Chrome you evenn have access the the dev tool and everything like that. But the other suggestions might be better suited as they might be more lightweight.