NAFIS stands for
It's based around forging and customizing your weapons, taking some inspiration from, but not being a direct ripoff of Tinkers / other similar mods.
As of version 0.8.0 you can now level up your tools/weapons to improve their stats. The required XP per levels can be configured, as well as the entire leveling system disabled.
Requires DoomedFabric to work.
It also provides an API to add your own Tooltypes and -materials, as well as custom Forges.