Screenshot of the Richter plugin
Richter

Richter is an experimental tremolo/amplitude modulation tool with a pair of LFOs to modulate the audio directly, each with its own additional modulation LFO.
Want to see Richter in action?
Check out our tips and demos on YouTube
Multple wave shapes and tempo sync
Screenshot of one of Richter's LFOs
Each LFO has four invertable wave shapes to choose from, tempo sync, phase offset, as well as the usual rate and depth controls.
Create complex interactions using the modulation oscillators
Screenshot of one of Richter's LFO pairs
The MOD LFOs are identical to the LFOs above them, but rather than modulating audio they modulate the rate and depth of the LFO above it to unlock more creative options.
Process left and right channels separately
Screenshot of a pair of Richter's LFOs configured in stereo
By default the output of both LFOs is multiplied together with the audio, but in stereo mode one LFO will be applied to the left channel and the other to the right.
Richter is an open source project released under the GPL
You can find the source code here: https://github.com/jd-13/Richter-Tremolo
I make every effort to ensure these products are reliable and great to use however I am only a single developer, so can't exhustively test every platform and use case.
As such all products are provided without any warranty or promise of fitness for purpose.