Automatic Wheat Farmer automatically plants wheat seeds in nearby empty farmland. Optionally it can also automatically harvest nearby (ripe) wheat.
Enable it by pressing P for Plant menu. If you have seeds in your item bar, when you approach farmland they will be planted. Harvesting only works if planting is enabled (to prevent griefing). You can only harvest when you are set to plant, and have seeds available.
Seeds automatically planted on nearby farmland
This works in singleplayer and multiplayer
For Minecraft 1.6.2
For Minecraft 1.5.2
For Minecraft 1.5.1