A reusable distributed computing framework may be established in which contributors of computing resources may participate by using a web browser to visit a web page that incorporates a distributed computing participation component. A distributed computing job provider may submit distributed computing jobs to a web-based distributed computing service. A distributed computing job may include browser-executable code in accordance with a particular distributed computing programmatic interface and data to be processed by the browser-executable code. The web-based distributed computing service may assign independently processable portions of the job data to browsers visiting a donor page for processing with the job code. Results returned by the donor browsers may be indexed and made available in real-time, as may a status of the distributed computing job such as with respect to processing the job data.