I made my own effects in C++ using JACK audio.
I made a filter, delay, chorus, wave shaper/ distortion and a tremolo.

You can download them yourself here and see some examples. Only download JACK audio!

https://github.com/JorisTakken/CSD2/tree/master/CSD2c/assignments/effects%2B%2B https://github.com/JorisTakken/CSD2/tree/master/CSD2c/assignments/example_effects