I like moodtracker.com since it has features where I can keep track of how severe my depression/mania is, amount of sleep, anxiety, and irritability level. Then, it gives you a section where you can freely journal, and I always use that space to write whatever comes to mind. I would recommend it. I get a feeling that I am taking a step towards taking care of myself by tracking my mood and journaling since it's something I can do just for me and my sense of wellbeing. There are periods of times where I will stop doing it for whatever reason, but I always feel better when I get back into it again.