Zotero [zoh-TAIR-oh] is a free, easy-to-use tool to help users collect, organize, cite, and share their research sources Users can add PDFs, images, audio and video files, snapshots of web pages, and really anything else. Zotero automatically indexes the full-text content of their libraries, enabling them to find exactly what they’re looking for with just a few keystrokes.
Viewshare is a free web application for creating interfaces and visualizations of cultural heritage collections. It can create interactive maps, timelines, facets, tag clouds, histograms, and image galleries. The intended users of Viewshare are individuals managing and creating access to digital collections of cultural heritage materials.
GRASS GIS is free and open source software used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization.
Yahoo! Pipes allows users to combine, filter, translate, and geocode data from RSS feeds, JSON, KML, or other similar formats, and power widgets/badges using that data.
*Courtesy of DiRT Directory