Authorizer is a gem for Ruby (in conjunction with Rails 2.3) that does authorization for you on a per-object basis. What makes this gem different from e.g. declarative_authorization and cancan is they define one role for the entire application. With Authorizer, you define roles for different user...

gephi_keeper is a Ruby conversion gem that links YourTwapperKeeper (http://your.twapperkeeper.com/) to Gephi (http://www.gephi.org) by converting JSON output from YTK to Gephi's GEXF format. YourTwapperKeeper is a self-hosted service that archives tweets. Gephi is a graph visualization tool. YTK...

Real Estate Price change module for the Netherlands. In the Netherlands, one of the ways to index rent prices is to multiply the price with the Dutch Bureau of Statistics' (CBS, http://www.cbs.nl/) Consumer Price Index (CPI). The CPI is a float number larger than 1.0 that indicates the multipli...