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ASP.NET Core
ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.
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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# is a language. Think of Unity like a dialect. Not every region in a country use the same exact language, they have regional differences, but the fundamentals remain the same. Unity uses Mono, which is one of those regional difference. There is also dotNet, asp.net, etc.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.