IrfanView, Adobe Bridge, ACDSee Photo Studio, ImageGlass, Evince, Preview, Gwenview, nomacs, GonVisor, Pixea, Eye of GNOME, JustLooking, Simple Comic, Qoppa PDF Studio, ComicBookLover, Imgseek, LilyView, Comical, JPEGView, gimmage, NeonView, GQview, GImageView are some alternatives to Xee.