Both of the major D&D sheets allow you to place proficiencies. For what you are describing, the D&D5e by Roll20 is probably the better bet. There is a section specifically for proficiencies which can include weapon and armor types, Tools, custom skills, languages, and so forth. Edit: Tools are in a box directly above the other proficiencies, but they are right next to each other. Custom skills would go in with the tools, since you can indicate an associated ability check and whether you have expertise.