Szyszka is a simple but powerful and fast bulk file renamer.

Features
- Great performance
- Gui created with GTK 4
- Multiple rules which can be freely combined:
  - Replace text
  - Trim text
  - Add text
  - Add numbers
  - Purge text
  - Change letters to upper/lowercase
  - Custom rules
- Save rules to be able to use them later
- Ability to edit, reorder rules and results
- Handle even hundreds thousands of records