This is the first (more or less) serious application I wrote in Go and I absolutely loved it 
Repository: https://github.com/zupzup/calories
Calories is a command line tool for tracking calories and weight using the Harris Benedict formula for calculating your BMR (Basal Metabolic Rate).
It currently provides the following features:
- Weight Timeline
- Day / Week / Month Overview
- Personalized Configuration
- Metric & Imperial Support
- JSON Import / Export
- Optional JSON Output for all Commands
- History
Have Fun 
regards,
mario