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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.
NooDs - A New Standalone NDS Emulator. Haven't used it yet but so far been hearing good things about it especially from Mr. Sujano over at YouTube. Here's their Github Page.
DeeS - a Fork of NooDs. So far DeeS Goals is using NooDs as a "Core" and will receive a "complete rewrite" in the future which I'm assuming means different UI or something(key word here is "I'm assuming" so don't take my word for it). They also have their own Github Page.
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.