Widgets: are interactive virtual tools that provide single-purpose services such as showing the user the latest news, the current weather, the time, a calendar, a dictionary, a map program, a calculator, desktop notes, photo viewers, or even a language translator, among other things.
Data Mining and Extraction Tools: offer applications that allow users to either produce maps, tables, or charts of the subset of data that are specific to the user's interests or to build their own dataset extracted from a data source. Note that many of these sites also offer downloadable data.The data mining tools that provide access to data that are not available for the raw data catalog are of particular interest.
RSS Feeds: RSS (also known as Really Simple Syndication) is a format of data feed some agencies use to provide frequently updated content. When an agency feed is syndicated it means an individual can subscribe to it and get automatically updated content from the aggregator of the particular feed.