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SFTPGo
Full-featured and highly configurable SFTP, HTTP/S, FTP/S and WebDAV server - S3, Google Cloud Storage, Azure Blob
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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.
I think caddy has a webdav plugin (https://github.com/mholt/caddy-webdav). I don't use caddy though and haven't tried it myself. There is also sabre (https://sabre.io/dav/) which is used by NextCloud, so I think that should be supported for a long time. Apache's webdav should stick around a while.
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.