From their site: The Google Spreadsheets data API allows client applications to view and update Spreadsheets content in the form of a Google data API ("GData") feeds. Your client application can request a list of a user's spreadsheets, edit or delete content in an existing Spreadsheets worksheet, and query the content in an existing Spreadsheets worksheet.
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The Google Sheets .NET library contains dynamic link libraries that import to access the .NET library into web applications. It works with 2.0 framework. Instructions to create a development environment include to download the latest data API, run the installer, and implement the code.
The Google Sheets Java library is an open source project that works in Eclipse or NetBeans. This library can be opened from a ZIP file because it contains JARs archives that need to be imported to access the Java library. Google includes steps to work with the Sheets API.
MediaWikiWidgets.org is a community project to maintain a collection of widgets for MediaWiki Widgets extension.
MediaWiki Widgets extension allows adding widgets to wiki by just creating pages in Widget namespace.