I use it as a core part of my self-hosted infrastructure, as an alternative to IFTTT or Zapier.

I do simple things with it, like monitor GitHub for releases of software I use, filter out release candidates and post the info to a Mattermost server. This helps me stay current With projects where I maintain a public Docker image for them.

Huginn also does more complex things like act as the engine for an app running as a series of functions in OpenFaaS. That app pulls data from various sources, aggregates it, dedupes it according to various criteria, does a bunch of subsequent lookups, stores results in Mongo and then collects the output once a day and sends it as an email.

Huginn is an excellent tool.