Last year I wrote about my mood tracking technique here. While I still have similar approach of logging, over months I made a better visualizer for the entries. It's called mento and is here. Pulling the screenshots from repository here:

Figure 1: Mood plot. This shows mean mood for a day. The calendar allows navigating through the journal on the right pane.

Figure 2: Mood scores plotted on 24 hours wheel. This is a new feature and I am not very sure if it's helpful. But I think few other trackers (non mood) might show something more.

Figure 3: Total entry counts

I might not try to generalize the approach of logging and visualization, but I am interested in building a correlation finding mechanism in mento. My entries have a lot of variables and trackers that could have interesting relations.