King of the hill is PTGui and its only real former competitor, AutoPano, is now abandonware. Source: about 1 year ago

A full-featured stitching utility like PTGui - If you are going to be doing any amount of extensive stitching, you are going to be using a dedicated stitching utility like PTGui. Let's say you shoot a 3-frame pano, and you have a parallax problem in the overlap between frames 1 and 2. You just go in with PtGui, and mask the area say in frame 1, so that PTGui will use that designated area from frame 2 for the... Source: about 1 year ago

For my own site I use PTGui Pro. It's not made for Wordpress, but I developed a workflow that works for me... And any solid Wordpress/PHP developer should be able to do the same for a Wordpress site. Source: over 1 year ago

PTGui is probably the best panostitching software package, but it's not for casual users who occasionally stitch as a personal-use license is about US$159 and a PTGui Pro license is $317. Can, like most full-featured spherical pano stitchers, do panostitching and HDR or exposure fusion at the same time. Source: almost 2 years ago

PTGui is the best app for pano stitching, with excellent HDR tools: https://ptgui.com/. Source: almost 2 years ago

There is also JPEG View which is really fast and simple image viewer for windows https://github.com/sylikc/jpegview) It is very fast, specially noticeable on very large images. - Source: Hacker News / 3 months ago

JPEGView - lightweight image viewer for Windows. ShareX - screen capture tool with other nice features. Source: about 2 years ago

JPEGView should be close enough to what you want. It's very light-weight. Source: about 2 years ago

JPEGView is great, lightweight and opens stuff fast https://sourceforge.net/projects/jpegview/. Source: about 2 years ago

JPEGView - Lean and fast image viewer with minimal GUI. Source: about 2 years ago