FNVHasher - a very simple opensource hash calculator by ArtUrlWWW
This is developer tool, hash calculator for hex/dec conversion of various FNV flavours.
It similar to ModdingToolbox (Fogity / formerly known as Hasher).
ModdingToolbox is not opensource project and it has not GitHub repository, and it's not maintained.
MTS_ArtUrlWWW_FNVHasher is opensource, you can use it or as ready-to-use hasher, or as DLL library for using in your projects.