Choose a folder and ThumbNailer creates thumbs for all the pictures in the folder ... click on a thumb and the picture is displayed in a larger view window ... click on the view window to open a resizable window for the picture you select. Rotate photos...

Multi-Thumbs is similar to Mike's ThumbNailer ... but shows an entire screen full of thumbnails ... similar to iPhoto. Get a full screen view of a picture with a simple single click ... click it's there, and click it's gone. Unlike iPhoto you don't need...