Holmes
Holmes is the software companion of the Wattson electricity monitor (http://www.diykyoto.com/uk/wattson/about). This software will show you how much electricity you've been using over the last 28 days. It can also store your data for months and even years. The software has graphs to show you how much you've saved and when. You can look at your data by hours, days, and months. Installation is very easy; it can be done on both PC or Mac computers. You just need to download the software from the web site.