Electro Harmonix Frequency Analyzer

Here are two layouts for a classic Ring Modulator.
The first one is for a vintage version (schematic available here).
The DIP version of 1496 had a different pinout.
The second one is for the modern vesion and it could potentially fit in a 125B size box (there is no schematic but a PCB layout here).
Not sure if they have been verified.
You should be able to use Mark's Bipolar Voltage Converter.

Crowther Audio Prunes & Custard

Here is another great pedal we didn't have a layout for.
You can find original thread and schematic here.

Parasit Studio - The Xor'cist

A new Stutter Fuzz / Ring Modulator by Freppo from Parasit Studio.
You can find all info about this project and PCBs at http://www.parasitstudio.se/.
To make sure this project is built correctly (for momentary or latching Stutter footswitch)
you must follow his Build Document here.