The Manther is Malekko's standalone sequencer synth, the Manther Growl is the voice from the Manther but in eurorack form.
The Manther Growl has some interesting features such as a wave folder that can either be pre or post filter and two adsr envelopes one of which is dedicated to modulation duties.
They have managed to pack a load of stuff into a relatively small front eurorack panel.
More info at Malekko
A mix of features from both East and West