PreFlight is a new open source slicer by oozeBot based on PrusaSlicer but with deep rework of its internal code.
- True 64 bit architecture
- G-Code processing in memory only
- Athena perimeter generator improving over Arachne
- Interlocking perimeters similar to brick layers
- Deeper RRF (RepRapFirmware) integration
- Physics-Based Time Estimation
- Improved paint-on for seams and supports
- Cooling fan early spin-up
- and many more …
Links:

Athena perimeter generator vs Arachne

Interlocking perimeters vs Brick Layers

Mixed support types on a single object
Source via Fabbaloo
