3to1 is a utility module, with three inputs and one output. The output voltage being the exact addition (or subtraction) of the three input voltages.
The Eurorack Stripboard protoboard is now available in the awesome DIY Layout Creator software since version 4.17!
The USB Power Output module is a simple 3HP wide utility module with 4 USB A connectors. Perfect for powering a lamp, a small Keyboard (I use it for my Arturia Keystep) or anything else.