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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.
CMS is a pretty generic acronym for "content management system" so may need more context here. asp.net is an extension of the Microsoft C# .NET framework that provides tools for specifically developing web applications or complex websites. Similar to how you can use Unity and C# for game development. Also, I believe the Core label is what Microsoft uses to denote the cross-platform version of .NET
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.