Solid State Guitar Amp Forum | DIY Guitar Amplifiers

ST Modular has released it's new line of "Workmates."  They are DIY kits for passive circuits.  They include an Attenuator, EQ, Combiner, Swap, "Clipping Cat," and LPG (low pass gate).  These use SMD componentry and according to ST Modular, they are a very easy circuit to practice your SMD soldering skills.  I think they are really cool, but haven't seen anything on pricing or availability.

https://www.gearnews.com/st-modular-workmates-adorable-passive-0hp-eurorack-tools/