Here are a few sound developers that create content in Maschine format:

Loopmasters – various types of kits and libraries in Maschine format

Native Instruments – official expansions from NI containing drums, synths, instruments, effects, projects, etc.

MVP Loops – created the M-Paq series, exclusive urban sound content in Maschine format

FluxWithIt – experimental drums, synths, and boom bap kits in Maschine formats

Big Fish Audio – various products and sounds in Maschine format

Goldbaby – high quality analog processed drum and percussion samples for Maschine

Diginoiz – Maschine format drum kits and libraries

Maschine Masters – rugged drum and sample kits for Maschine

Hello Samples – cool organic drums, keys, and synth samples for Maschine

The Loop Loft – high quality drums, percussion, and instrument samples for Maschine

MPC-Samples – drums and samples in Maschine and other formats