Simple VCO, ClockDivider, Simple LFO, Multi and 3to1 Precision Adder Unity are among Electronic Things... and Stuffs most popular products.
Simple Triangle/Square LFO - deprecated (V1.1 and previous)
Power - The Switched Mode Power Supply
2 Chained Passive Multiple
A simple Rectangle/Triangle LFO for your rack (V1.2 and later)
Drum Module 77
DIY friendly 4HP Simple VCO
2-channel 3-input Unity Gain Mixer
3 Passive Attenuators
MIDI to 8 Digital Outputs
TR-606 Bass Drum "clone"
Arduino Clock Divider/Gate Utility module
Single Chip, DIY friendly 4HP Simple VCA
Simple Triangle/Square LFO V1.1 1U tile
4 AC-coupled mono input mixer
MIDI to 4 Digital and 4 PWM Outputs
A simple tuner