Tritium

Though the architecture is extremely simple and not very flexible, it does have it's own biting character that may be useful at times and the CPU utilization is extremely low by today's standards. There could be times when this kind of instrument may be exactly the kind of thing you need to dial up a sound very quickly and want a no-nonsense user interface without numerous menus or pages filled with parameters.

I do get the impression that this is attempting to fill the shoes of a poor man's 303 or Novation Bass Station and while it can produce some of those kinds of textures, the quality of the oscillators and filter is not really there to emulate those very faithfully to me.

One criticism of the knobs is that they are circular motion controlled, so they're a little funky to use (to me, anyways) unless your host offers global control over this behavior.

If you're looking for a freeware bassline instrument, this may have what you're looking for. After all, it's free, so what have you got to lose?