I'm fairly new in the Ruby + Rails scene. Although I have a very strong understanding of design patterns, data structures and algorithms - there's a ton of "must have" plugins that I haven't had a chance to run into yet. There's things for migrations, resource controllers and a myriad of other plugins that make developing for these platforms significantly easier.
Would anyone be kind enough to share links for some of the most commonly used ones that every savvy Ruby or Ruby on Rails developer knows about. Something that's so important, that it might even be considered to be merged into the core at some point.
Hope that's appropriate for this forum. I surely think it is.