Quite possibly the most cherished thing I own. I am quite a fan of Gransfors Bruks tools. To me they are to axes what Estwing are to hammers. Gransfors Bruks is the axe making company.
For my kind of work the smaller Wildlife hatchet or Kubben axe is usually the more popular but I just saw the carpenters axe to be a much more versatile tool than the other more popular models. The straight handle and ground back means you can properly use this for hammering nails or as a mallet if need be. The other advantage to me is the straight(ish) cutting edge. I find this to be very effective in creating flat surfaces on difficult, uneven pieces of timber. It's profile is also thinner than the other models making it excellent for fine carving. It's almost like a giant scandi-knife. When it comes to splitting I usually go for something more specialised but with this axe I simply place the edge where I want to make the split and give it a whack of a mallet and it creates a lovely straight crack along the log.
All in all an absolutely beautiful tool to work with! This particular one was forged by Kjell Åke Sjölund.