Pokemon Heroes is made in order to continue Nosman’s Pokemon Hack project that was stopped. It is based on Pokemon Ruby and in Spanish.
Pokemon Darkblue is another Pokemon ROM Hack from the creator Lex. It is based on Pokemon Ruby (U).
Pokemon Mitic Island is an awesome Pokemon Hack with many great features but one disadvantage of it is using Spanish.
Pokemon Shiny Gold is one of the popular Pokemon Hacks that is based on Pokemon FireRed English.
Pokemon Never Black & White was created because the author hated Pokemon Ruby and wanted to change it.