OOP: Code related to object-oriented programming.

lang/scheme/oop/

   bos/       BOS: Bryan's Object System
   meroon/    Meroon and Meroonet: Small and efficient OOP for 
              Scheme.
   methods/   Methods: Tiny object-oriented programming system 
              for Scheme.
   minioop/   MINIOOP: Minimal object support for Scheme
   mos/       MOS: Macroless Object System for Scheme
   scoops/    SCOOPS: Scheme Object Oriented Programming System
   sos/       SOS: Scheme Object System
   tinyclos/  TinyCLOS: Subset of CLOS in Scheme, with 
              metaobject protocol.
   yasos/     YASOS: Yet Another Scheme Object System