BRSfx is the lofi. sort of simulates a bad radio signal.
The name stands for "Bad Radio Signal simulator". It adds strange artefacts to your sound and is just really noisy.
F2FM is the harmonicifier. designed for bass.
The name stands for "Filter to Frequency Modulation". It takes an oscillator, applies filter and resonance, and then uses that as the modulator .....
the ringmod. designed for leads / chords
I forgot what the name stands for. "Subtraction Triple Ringmod Filter Engine" or something like that. It combines filters with ring modulation in an .....
DoFi is the toy. it makes funny vocal-esque sounds.
The name stands for "Double Filter", which also describes exactly how it works. Not much more can be said about it because of its simplicity.