I happened onto this Kickstarted campaign for a network controllable 8 relay board. Not that this is unique, but their prices look good and they have a range of products. This might be a real contender against EasyDAQ and Weeder as well as Phidgets and RPi for those who do not need the power of Linux. BTW, there does not appear to be an API yet, but, the boards do have a built-in web server so control via curl would work.
They were funded and more information is available from http://www.linortek.com But, the web site looks pretty rough (not like Indigo Domotics), though they do appear to be selling boards.
YMMV