Makey Makey - the original

Adafruit

Product 1602 - CAP1188 - 8-Key Capacitive Touch Sensor Breakout - I2C or SPI

Learn - Adafruit CAP1188 Breakout

Product 1982 - Adafruit 12-Key Capacitive Touch Sensor Breakout - MPR121 - STEMMA QT

Learn - Adafruit MPR121 12-Key Capacitive Touch Sensor Breakout

Product 239 - Full Sized Premium Breadboard - 830 Tie Points

Instructables

Make Your Own Makey Makey!

Parts Sources:

Electrical & Electronic Supply Inc.

HardCore Electronic Supply

Coding:

Scratch