This is the AMbitious STanDard library, available under LGPL.

It is a collection of miscellaneous Ruby modules by Minero Aoki.
Several modules of his are using those modules.

bench.rb: very simple benchmark		packing.rb: makes package (.tar.gz)
bug.rb: 'bug!' method			pipeline.rb: filter file       
dispatch.rb: "event handler" method	rbparams.rb: parameters related ruby
errutil.rb: protects exception		recycle.rb: recycles objects   
extmod.rb: abstract/property methods	rubyemu.rb: ruby emulation     
futils.rb: file utilities		strquote.rb: String#quoted     
gconst.rb: defines global constant	timer.rb: timer class          
getdep.rb: gets file dependency		to_s.rb: _name2str, _type2str  
inst.rb: helps installation		version.rb: VersionNumber class
must.rb: must/must_have/must_be methods

WWW: http://www.loveruby.net/en/amstd.html