One for the Google Chrome Browser Users...

TheBigYin

Stravistix...

It's a Chrome "plugin" that adds quite a few extra bits of analysis and download extras to the basic Strava Experience...

Activity improvements

• Zone distribution through charts and tables of
  • Speed/Pace: Quartiles, standard deviation, ...
  • Cadence: Quartiles, Pedaling/freewheel time, Crank Revolutions
  • Heart rate reserve: Quartiles, Training Impulse
  • Power: Quartiles, Variability Index, Punch Factor, Weighted Watts/Kg
  • Grade: Quartiles, Grade Profile, Times and percentages during climbs, flats and downhills
• Each zones for each data type is customizable in Stravisitix Options.
• TRIMP (Training Impulse) score. The TRIMP is a number calculated according to the time spent in heart zone, to determine the training load. ( http://fellrnr.com/wiki/TRIMP )
• TRIMP / Hour
• Ratio of activity: time moving over total time of an activity.
• Thoughness Score: global involvement score into in the activity. It represents your motivation into activity. This score is based on the ratio of activity, elevation, average speed, and distance. (Coming soon for running)
• Weighted power cycling
• Weighted power / kg in cycling
• Cycling variability index. This index shows activity smoothness in terms of effort Cycling intensity index or Punch Factor.This index indicates you were below or beyond of your current power capacity (Functionnal Power Threshold)
• Distance display for each bike in activities
• Choosing the type of default Google map
• Integration VeloViewer in each of your activities
• "FlyBy" integration: People who make sports with you.
• OpenStreetMap flipper. Available osm maps: Cycle, Landscape, Street, Os, Outdoors. Garmin TCX export.
• Weather for cycling activities
  

Segments improvements

• Exporting cycling segment effort as Virtual Partner course for your Garmin device or other compatible GPS. File format: .crs, .tcx, .gpx
• % rank in segments
• Nearby segments around watching segment.
• Default order in segments: All, Man, Woman, People I am, My results

Other cool things

• Integration KOM/CR map
• Integration of Heat Map Global Strava
• Hidden challenges or/and roads created in the Dashboard

If you're already using Google Chrome, it's got to be worth having a look at...

Spatialized

Love this plug-in, been using it for awhile...it feeds my data nerdiness!