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Command Line Parser
The best C# command line parser that brings standardized *nix getopt style, for .NET. Includes F# support
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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Dapper
Discontinued Dapper - a simple object mapper for .Net [Moved to: https://github.com/DapperLib/Dapper] (by StackExchange)
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
i dont really know about newtonsoft's offers but a quick search shows that company does json only Json.NET - Newtonsoft
As a sidenote, speaking of annotations themselves, here they are in C# (this link is a prime example of their usage for command line options) : https://github.com/commandlineparser/commandline
Microsoft recently open sourced fluid framework. It is a distributed, consensus based, real time collaboration framework written in typescript. Fluid would keep your clients synced up and your server code would only have to handle when someone hits submit. Fluid Framework
Entity Framework Core StackExchange/Dapper
With Scrutor you can decorate (AddDecorator) the injected service. Fits your usecase, see tutorial here