Garmin dominates the GPS running watch market. They sell more GPS watches than Polar, Suunto, TomTom, Coros, and Fitbit combined.
Fitbit built the original all day activity tracker. The newer devices do a solid job of tracking runs as well.
Polar invented the world's first portable heart rate monitor in 1975. They remain a leader in heart rate training.
TomTom built solid and inexpensive GPS running watches until 2017. Smashrun can still sync runs from those old watches if you run with one.
Nike Run Club is one of the most popular running apps, but they've gone through great lengths to prevent users from exporting their data.
The Microsoft Band was a brilliant device packed with sensors. It didn't last long. We can no longer import from Microsoft Health since it was shut down.
Magellan created the first handheld GPS receiver in 1989. Unfortunate their fitness watches never really caught on and the Magellan Active site we synced data from was shuttered.