supports all major graphic formats including BMP, JPEG, JPEG 2000, GIF, PNG, PCX, TIFF, WMF, ICO, TGA and camera raw files. It has a nice array of features such as image viewing, management, comparison, red-eye removal, emailing, resizing, cropping, color adjustments, musical slideshow and much more.

A free (2012 version) set of tools for Windows & macOS. For the free version you enter your email address and they send you the download link
https://nikcollection.dxo.com/nik-collection-2012/

B&W rendering - Silverefex Pro2 , 

Sharpening, Colour adjustment, Etc.

A paid-for 2019 version is available but is little different!

An image editing software solution for Windows or macOS. With powerful tools for organizing, color grading, layer editing, and much more, you have full control of both your images and your workflow.

An image editing software solution for Windows or MAC. With powerful tools for organizing, color grading, layer editing, and much more, you have full control of both your images and your workflow. Monthly subscription of less than £10 gives you Photoshop, Lightroom and Bridge

Xee is an streamlined and convenient image viewer and browser. It’s similar to macOS's Preview.app, but lets you easily browse the entire contents of folders and archives, move and copy image files quickly, and supports many more image formats.