Brainchild supplies various IO modules including,

IO-16DI: 16 digital input
IO-16DO: 16 digital output
IO-4RO: 4 relay output
IO-8DIO: 8 digital input/8 digital output
IO-8TC: 8 thermocouple input
IO-6RTD: 6 RTD input.
IO-8AII: 8 analog input 0/4-20mA.
IO-8AIV: 8 analog input 0-10V

IO-DAIO: 2 RTD I/P, 2 AI, 1 AO, 4 DI, 2 DO. (read more)

Basic ON/OFF control of a lamp, pump, etc. after receiving an input (a contact, b contact) such as a button or switch, Complex input conditions can also be made combining AND circuits, OR circuits, etc. (read more)

The USB-to-CAN compact is an intelligent low-cost CAN interface for the USB-Port (read more)

The SeaDAC Lite USB digital I/O family offers system designers a compact, low-cost alternative for interfacing any USB equipped computer with real world signals. SeaDAC Lite products feature optically isolated inputs and four Reed or Form C relay outputs. All SeaDAC Lite products include Sealevel's SeaLATCH™ locking USB connector design to prevent accidental cable disconnection. (read more)

Isolated serial interface adapters offers an easy way to connect serial devices to a USB port. The serial port is configurable for RS-232, RS-422, or RS-485 without opening the case. Optical isolation helps prevent damage caused by surges and ground loops commonly found in industrial environments. SeaLATCH™ locking USB connectors prevent accidental cable disconnection. (read more)

Modules are powered from the USB port - no external power connection required. (read more)

USB to 8 Isolated Inputs/8 Form C High-Current Relay Outputs Digital Interface Adapter
Control and monitor 8 optically isolated inputs and 8 (SPDT) high-current Form C relay outputs via any USB connection with the SeaDAC PLC-16H. (read more)

USB 1-MHz, 16-bit multifunction module with outstanding performance and synchronous analog, digital, and frequency I/O in one compact package. (read more)

The NEW U2300ASeries USB data acquisition familyconsists of 7 modules - ideal for design validation and man-ufacturing engineers who conduct data logging, measure-ment or monitoring in a broad range of industries. (read more)

Luminary Micro's New Stellaris® Microcontrollers Are Industry's First Offering of USB On-the-Go and Host Capability with the ARM® Cortex™-M3 Processor

Thirty New Award-winning Stellaris Family Members Add USB Connectivity, Superior Motion Control Performance, Smaller Package Options, and Green Application Energy Efficiency (read more)