Are there there similar but open and private solutions to Garmin/etc for h/w and Strava/RunKeeper/etc for software?

Some solution where I can track my runs, swims, cyclings, treks just like Strava (et al) does does but I can choose to keep the data wherever I wish - local, or sync to an app on computer or to a self hosted server.

Maybe not Garmin but I would love to use such an iOS Strava alternative with similar accuracy and detail.