free and open source Q&A software, open source stackoverflow style app written in ruby, rails, mongomapper and mongodb.
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A Ruby on Rails-based OpenID server for all ya identity providers out there. It supports the current OpenID specifications (OpenID 2.0) and supports SReg, AX (fetch and store requests) and PAPE as well as some custom additions like multifactor authentication using a yubikey (see http://yubico.com)
most up-to-date public build of shapado think variant