iMazing HEIC Converter - iMazing HEIC converter is a free Mac and PC app which converts photos from HEIC to JPEG or PNG.
QuickLook - Bring macOS “Quick Look” feature to Windows.
Kingshiper HEIC to JPG Converter - Kingshiper HEIC to JPG Converter is an easy-to-use tool that converts HEIC photos to JPG, or other formats with 3 simple steps.
Seer - A Windows Quick Look Tool in Qt.
Aiseesoft HEIC Converter - Aiseesoft HEIC Converter is a useful tool that converts photos from HEIC to JPG/JPEG or PNG. You can open iPhone HEIF images on non-Apple devices conveniently.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!