https://miandata.org/
Mian: 16S rRNA Operational Taxonomic Unit (OTU) data analysis, visualization, and feature selection...
Mian is a data visualization, statistical analysis, and feature selection platform for 16S rRNA microbial OTU data
https://www.yourdictionary.com/operational-taxonomic-unit
Operational-taxonomic-unit Definition & Meaning | YourDictionary