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Captcha Control (C#) allows users to add a captcha to an asp.net page. The control supports declarative settings of fontsize, font family, color, captcha length, background image, character set, success, error and buttons' text. Supports audio - reading out the captcha text.
ocPortal CMS have all the features you would expect from a website engine: for instance photo galleries, news, file downloads and community forums/chats, but it does so whilst meeting the highest accessibility and professional standards. It is also smart enough to go beyond page management, to automatically handle search engine optimisation, and provide aggressive hack attack prevention.
IndexTank search engine powers search in Reddit, Social bookmarking site. IndexTank is acquired by LinkedIn and released the project as open source. It includes features like Variables boosts, Facets, Faceted search, Snippeting, Custom scoring functions, Suggest, and Autocomplete.
Socialauth provides support to authenticate users through external oAuth providers like Gmail, Hotmail, Yahoo, Twitter, Facebook, LinkedIn, Foursquare, MySpace, Salesforce, Yammer as well as through OpenID providers like myopenid.com. It could be easily integrated.