OneTrick Chonk
A physically modeled electric bass monosynth that produces a classic sound perfect for a wide variety of musical genres. It’s powered by digital waveguide synthesis to simulate the vibrations of a string. Different play styles like muting, fingering, picking, or slap can be achieved with articulations.
Price: $59
The source code is also available for you to inspect, adapt and learn from under the GPLv3.