Public resource computing (PRC) is an innovative approach to high performance computing that relies on volunteers who donate their personal computers' unused resources to a computationally intensive research project. Prominent PRC projects include SETI@home, Folding@Home, and distributed.net. Many PRC projects are built upon a PRC framework that abstracts functionality that is common to all PRC projects, such as network communications, database access, and project management. These PRC frameworks tend to be complex, limiting, and difficult to use. We have designed and implemented a new PRC framework called the Simple Light-weight Infrastructure for Network Computing (SLINC) that addresses the disadvantages we identified with existing frameworks. SLINC is a flexible and extensible PRC framework that will enable researchers to more easily build PRC projects.