Thanks for asking. Mainly only two steel splitting wedges (Stubai) with self-made extra long ash wood handles (with iron ring on top) for proper impact (the ones from the hardware store didn't last long), and a heavy mallet or a Halder/Simplex malleable cast iron with ash handles that I made myself as well. I'll take a photo my tools later on. I usually get along with the two splitting wedges mentioned, otherwise I use a third iron wedge or the Fiskars splitting axe. When the trees are very difficult to split (due to twisted growth and many branches), I sometimes use a chainsaw to weaken the tree at some point mostly on the bigger branches. To work out the branches nicely, I placed a wedge just in front of and just behind the branch, then the sapwood jumps away or tears apart.

Over a length of more than 2 meters, the wedges must be applied more frequently and precisely, otherwise the splitting processes usually break outwards.