Far and away my favorite tool in the garden is my hands!
I can feel the plants, work in the dirt, pick off undesirables, and be delicate when I need to be. With this tool I can make holes, sow seeds, and hold flowers up so I can smell them better. I can also pull weeds, scatter pellets, and move both dirt and plants exactly where I want them. My favorite tools are an unlimited resource for me!
I have two of these tools and they came as a free add-on with the rest of my body at birth, so I'm afraid I cannot provide a link on the web for more information or a manufacturer...but most people can just look at the end of their arms for their personal version of the same tool.