FW AC E Meter
This is firmware written in C which uses the Atmel 90E24 energy management chip and an Atmel ATMEGA328P. It leverages u8glib to control a 128*64 graphics display.
Someone who knows what they are doing around hazardous mains voltages can use this code as a starting point for a really nice AC energy meter:
Here's a short video of it in action
Hardware Project
License GPL 3.0.
Use at your own risk. Not responsible for injury, death, or property damage.