Picture of Raspberry Pi Irrigation Controller http://jenfoxbot.blogspot.kr/2014/10/raspberry-pi-irrigation-controller.html
I have a smaller one... and works pretty well... ready to move up to a few more hoses...
Tested: OpenSprinkler 2.0 Arduino-Based Irrigation Controller - Tested
Internet connected irrigation control, looks well deigned! Rachio Iro 8 Zone Smart Irrigation Controller
For the Garden
Picture of ESP8266 Irrigation Controller
Galcon 8006 AC6 6Station Indoor Irrigation Controller *** Continue to the product at the image link.
DIY Life Hacks | Raspberry Pi Irrigation Controller
Smart Wireless Irrigation Controllers - DIY and off the shelf solutions for remotely controlling your irrigation from your smart device -
Home Design and Decor
Rachio Iro Smart Wifi Enabled Irrigation Controller 16 Zones, 2015 Amazon Top Rated Automatic Irrigation Equipment #Lawn&Patio
Amazon Top Rated Products
Hunter Sprinkler NODE400 NODE 4Station Irrigation Controller OutdoorGardenYard Maintenance Patio Lawn upkeep -- Continue to the product at the image link.