Frankenstein is a quick and dirty firmware, made from different bits and pieces (thus the name) for ESP8266.

• A nice and shiny commandline interface that reminds of u-boot. No more sloppy AT commands.
• Full command line editing.
• A very easy way of adding new commands to the shell
• Highly configurable (sort of)
  

  Resources
• GitHub Project Page
• Forum Thread on esp8266.com