migrid
A grid middleware with minimal user and resource requirements
...The goal of the MiG project is to provide Grid infrastructure where the requirements on users and resources alike is as small as possible (minimum intrusion). MiG strives for minimum intrusion but will seek to provide a feature rich and dependable Grid solution.
In line with the minimum intrusion concept, you only need to download and install the middleware if you want to run your own Grid. Users and resources only need a certificate and a browser to use MiG.