These crawls are part of an effort to archive pages as they are created and archive the pages that they refer to. That way, as the pages that are referenced are changed or taken from the web, a link to the version that was live when the page was written will be preserved.
Then the Internet Archive hopes that references to these archived pages will be put in place of a link that would be otherwise be broken, or a companion link to allow people to see what was originally intended by a page's authors.
This is a collection of web page captures from links added to, or changed on, Wikipedia pages. The idea is to bring a reliability to Wikipedia outlinks so that if the pages referenced by Wikipedia articles are changed, or go away, a reader can permanently find what was originally referred to.
mod_ruby is a module that embeds the Rubyinterpreter into the Apache web server to allow Ruby code to execute natively, faster than other CGI methods. Its drawback is that the characteristic sharing of classes among Apache processes is not safe for multiple applications[1] (e.g., multiple Ruby on Rails applications running simultaneously).
There is also the similar mod_mruby for mruby, a lightweight Ruby implementation.
As of at least 2015, the project seems to no longer be under active development.
