OwnTracks. Open source, self-hosted option that uses standard protocols. iOS and an Android apps available. This is turining out to be quite extensive. It also

OwnTracks. Open source, self-hosted option that uses standard protocols. iOS and an Android apps available. This is turining out to be quite extensive. It also have options for sharing with family (and friends). And triggering custom action when arriving/leaving a location. OwnTracks: https://owntracks.org/ https://owntracks.org/ Docs: https://owntracks.org/booklet/ https://owntracks.org/booklet/