Elettrolinux

The K8055 interface board, from Velleman, has 5 digital input channels and 8 digital output channels. In addition, there are two analogue inputs and two analogue outputs with 8 bit resolution. The number of inputs/outputs can be further expanded by connecting more (up to a maximum of four) cards to the PC's USB connectors. Here is some features;

...and some specifications;

For this interface board, there are various programs/utilities for GNU/Linux;