A range of interesting training tools from Ben Norbury, some of which link to your Strava data.
Workout TSS Calculator
Estimate a workout’s Training Stress Score™
Race comparison tool
Compare bike and riders setups on Strava segments.
A tool to help you work out your optimum hill for that Everesting attempt you've been dreaming of.
Strava Segment Leaderboards with Weather Data
Just pop in your Strava segment URL and it will magically show you a leaderboard that includes the weather conditions at the time. It's no surprise that the wind plays a huge part in most KOM's!
Estimate a riders Watts per Kilogram (w/kg)
For people who are seriously into hill climbs, you can use this tool to calculate how much more power other riders have got over you.
Or you can use it to calculate the power output you would need to get a PB up your favourite hill.