A simple openscad script that generate handles according to some parameters.
The options are explained by comments in the script itself, but for a quick recap you can decide:

- the length and radiuses (both ends) of the handle
- if you want its section to be round or elliptical and in case how much
- if you want its end to be flat or rounded
- if you want an hanging hole, its radius and if it should be round or elliptical
- if you want the tool end to have an hole or a peg
- if the hole/peg should be circular, elliptical or squared and its size

the parameters aren't checked for coherence so nothing prevents you from setting a tool hole longer than the handle and getting an hollow cylinder or something like that

In the preview picture my cheese grater with its brand new handle