Leatherworking Tools (videos)
I've never done any leatherworking myself (too intimidated at the prospect of messing up and wasting some poor animal's hide), but I have huge respect for those who do it well. If you're thinking about giving it a try, watch these videos for some ideas on tooling.
Home Made Leather Splitter by Canal de Aldo08101979
https://www.youtube.com/watch?v=LXbDDtZ7F_U
Making a leather edge burnishing tool by Richard Black
https://www.youtube.com/watch?v=KYTi-lr4V7Q
Handmade Tools - Homemade Tools - Leather Tools by Bruce Cheaney
https://www.youtube.com/watch?v=9N2_FiBo8JE
Handmade leather craft tool by Mr. Tolly (AKA: fatmantolly)
https://www.youtube.com/watch?v=6_9GqBcEyCo
Stitching Pony Leather Crafting Build by Crafted
https://www.youtube.com/watch?v=bCbSRO9Rqkk