Bug trackers would really benefit from a Discourse style UI. It lets users like comments (instead of writing '+1') and can summarise.
miniblog.
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I'm a fan of simple issue trackers. A description, comments, and maybe a small integration with something.
Given this, perhaps it makes sense to build your own? You get a bespoke solution, and focusing on your main project prevents feature creep.
Activity trackers now exist for animals too! Whistle is a Fitbit-style exercise monitor plus GPS tracker for dogs: https://www.wired.com/review/review-whistle-3-pet-tracker/
Ambient computing is becoming progressively more common.