See: https://github.com/SoftFever/OrcaSlicer and https://www.orcaslicer.com/

Ocra is a powerful, modern and Open Source, community driven slicer that can produce native Klipper gcode for the Neptune 4.

It offers advanced built in calibration tools, precision control of walls and seams (including scarf seams), sandwich mode walls, polyholes, a wide variety of infill patterns (including those optimized for high speed printers like the Neptune 4), mouse ears, adaptive bed mesh support, painting of supports, extensive modifiers, spiral z hop, and much more.

It's a derivate of Slic3r and PrusaSlicer, incorporating features from SuperSlicer and originally released as part of Bambu Studio (for Bambu Labs printers) before being forked by its original authors to a fully agnostic project which has very active support and development.

Versions of the software for Linux, Macintosh and Windows is available directly from the project's git repository. Beware of imitations!