FastStone Image Viewer, IrfanView, ACDSee Photo Studio, Photoscape, XnView, ImageGlass, XnView MP, Shotwell, Video Thumbnails Maker, nomacs, Free Opener, BIMP, JustLooking, ImBatch, Fotosizer, Fullscreen Photo Viewer, Tropy, Virtual Volumes View Photo Edition, Photo Batch, JPEGView, Cornice, VJPEG, Vallen jpegger, Open Freely, NeonView, Rest7 Online Image Converter, FuturixImager are some alternatives to QuickViewer.