LiteSQL is a codegenerator and C++ library that integrates C++ objects tightly to relational database and thus provides an object persistence layer. LiteSQL supports SQLite3, PostgreSQL, MySQL and oracle as backends.
Cross platform GUI managing bookmarks and shortcuts in a portable way. Support import/export, search, encryption, hierarchical tags, USB key installation, various environments integration, OS-dependent shortcuts, plugins extensibility.
wxSU is a plugin for Google SketchUp that extends the SketchUp API with the capabilities of wxRuby. wxSU bundles wxRuby to provide a cross-platform, pure Ruby solution for implementing GUI dialogs in your SketchUp plugins.
RDI is a library that gives your application the ability to install its dependencies at runtime. Perfect for plugins oriented architectures. Many kind of deps: RPMs, DEBs, .so, .dll, RubyGems... Easily extensible to new kinds.