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Wireless / Wired
Wireless and wired modules including Bluetooth, Ethernet, and IR kits.

Sensors
Modules for various types of sensors including accelerometers. gyro's, IR motion, etc

Display
LCD, TFT, OLED, LED modules

Motor drivers
Stepper and DC type motor drivers

Relay
Relay modules designed for interfacing to microcontrollers.

Power
Power converter modules

Adaptor
Modules for interfacing including USB to serial and SD adaptors.

RTC
Real Time Clock modules for microcontrollers

Audio
All modules related to sound (recoding/playback, amplifiers, speakers etc.)

Interface
Modules for interfacing to other devices or the outside world

Measurement / Signal Generation
Modules for measurement or testing of signals