xzgv is a keyboard-controllable fast picture viewer. Its thumbnail-based file selector can copy, rename and move images, rotate by multiples of 90 degrees and mirror them. Displayed images can have their zoom, contrast, brightness and gamma adjusted.
The killer feature why I use xzgv for more than 10 years and prefer it to all the others image viewers is xzgv's ability to be used in a toolchain -- to select a set of images for further processing. Selecting best photos, making them smaller, sending them over email, posting to Flickr or Facebook, etc, all this starts with a selection and this is where xzgv comes into play. This can only be properly appreciated by people who like to use command shell and write shell scripts. xzgv is very fast, has lightweight UI, all the necessary features for directory browsing and image viewing. No menus, no databases, no gimmik. Thank you, authors!