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Roslyn
The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.
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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.
C# works with the help of Roslyn, the official C# compiler, which is thankfully open-source, and is available here. The compiler supports all the features that are successfully approved for implementation, as determined by the Language Design Team. Through their Language Design Meetings, the LDT makes progress on open questions regarding proposals and considerations for concepts or features that may make it to some future language version.
The community is free to discuss and propose features, which discussions take place on the language repo (ensure you carefully read the instructions). There already are several interesting proposals, many of which are linked below for starters.