A free robo advisor built on Vanguard.
Open Robo is a free, open source tool to help you organize your investments. You construct an investment portfolio and it helps you maintain your chosen balance as you add or remove funds from your Vanguard account. Check out the project website for instructions.
Code: https://github.com/henrydavidge/open-robo
Disclaimers: https://henrydavidge.github.io/open-robo/disclaimers.html