Non-free web services exist that track users as they attempt to learn a habit, by keeping a counter of how many days they've successfully performed that habit, and resetting that counter if users fail to perform that habit.

This is a free software desktop program that duplicates the functionality of those services. It has no network usage, but is licensed under the AGPLv3, so that any derived web services (not that any should exist -- this software is basic) will be free.

This program is intended primarily as a vehicle for the author to play with python, pygtk, and quickly, so use it at your own risk.

A PPA for this project exists here: https://launchpad.net/~tedks/+archive/habittrack