[heyiforgotmypwd]

Why not TFAT or TexFAT?

[compressedgas]

Neither of those are bare flash file systems. They both require a flash translation layer.

[pjc50]

Is that license-encumbered? Also, as it points out, they don't include their own wear levelling.

[delfinom]

This is meant to run even on low-end micros without need for memory allocation. And support small SPI memory chips where you need to roll your own wear leveling across different size blocks of memory depending on chip vendor.