SageThumbs - SageThumbs is a powerful shell extension allowing to preview enormous amount of image formats...
CopyTrans HEIC for Windows - A plugin that lets you view HEIC photos on Windows and convert them to JPG by right-clicking.
Icaros - Icaros is a collection of lightweight, high quality, Windows Shell Extensions
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
FastPreview - FastPreview was created in need of a usable ...
iMazing HEIC Converter - iMazing HEIC converter is a free Mac and PC app which converts photos from HEIC to JPEG or PNG.