The Sparv pipeline is developed by Språkbanken and is used for annotating the corpora in Korp and the texts in Strix.
The documentation including installation instructions for Sparv 4 can be found on https://spraakbanken.gu.se/sparv. The source code is available on GitHub.
Sparv is also the annotation machinery behind the Sparv web interface, although the interface relies on an older version of the pipeline (Sparv 2).