Refarm the city
"Refarm the city (aka re:farm) is a collective project started and led by Hernani Dias with the purpose of developing open source software and hardware tools for urban farmers.
In its creators’ words, the project is a cross between a good meal (the crop, the seeds, the friends), hardware (the urban farm, the composter, the electronics, the sensors, the recycled materials), and software (applications that help you build a farm according to your needs, local crops, and gastronomy).
Re:farm seeks to provide people with tools to easily create, manage and visualize their urban farms. Its ultimate goals are to encourage the production and consumption of local goods, using methods that respect the environment, and promote organic agriculture, science, biodiversity, and local gastronomy.
The group has been hard at work for about a year now and, as you can see on their wiki, already has several sensors and boards ready to be reproduced, while other components (such as the software) are in advanced stages of design and development." (http://openmaterials.org/2010/03/24/refarm-the-city-open-source-tools-for-urban-farmers/)