There are many alternatives to gThumb for Mac if you are looking for a replacement. The best Mac alternative is XnView MP. It's not free, so if you're looking for a free alternative, you could try digiKam or Photoscape. If that doesn't suit you, our users have ranked more than 50 alternatives to gThumb and many of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to gThumb are Preview (Free), qView (Free, Open Source), ACDSee Photo Studio (Paid) and FastRawViewer (Paid).
digiKam is an advanced digital photo management application which makes importing and organizing digital photos a "snap". The photos are organized in albums which can be sorted chronologically, by folder layout or by custom collections.
ACDSee is a complex, multi-purpose application that serves for viewing, organizing and editing digital photos. Furthermore, images can be shared on social websites or your own space on the developer’s website.
FastRawViewer is an extremely fast RAW image viewer that allows the user to see the real RAW-data and the real RAW histogram, and it supports virtually every camera format currently on the market, as well as JPEG and DNG.
A pro tool for photographers Make sure your photo database is safe and efficiently managed. Uncompromising performance Engineered from the ground up for blazing fast speed, FotoStation functions seamlessly whether you’re processing 500 photos or 5 million.