Speedtest Tracker is a self-hosted internet performance tracking application that runs speedtest checks against Ookla's Speedtest service.
The main use case for Speedtest Tracker is to build a history of your internet's performance so that you can be informed when you're not receiving your ISP's advertised rates.
As far as I can tell https://github.com/henrywhitaker3/Speedtest-Tracker was abandoned. This version is meant to be an actively maintained replacement with an improved UI and feature set.
The docs can be found here https://docs.speedtest-tracker.dev to help you get started and also contains a full list of features.