this was only one I could find:
the ergdb.org website will redirect you to trainerday.com
I’ve used three:
- Garmin Connect on mobile and web, pushes to Garmin head unit
- TrainingPeaks (free and paid), push to head units or download and import into TR WorkoutCreator
- TrainerRoad WorkoutCreator but no export and can’t download to head unit =. can only use for trainer rides
TrainingPeaks is really quick & easy, its what I use although my outdoor intervals are simple enough to memorize and do manually.