If you are looking for a free alternative to image management and editing such as Lightroom, there are some good news: free and open source software darktable has reached version 4.0 (for Linux) and is finally available for Windows users as well.
The darktable was originally released by 2009 and has been used by professional photographers on Mac and Linux operating systems. The software includes a set of photo editing capabilities that helps you edit RAW files, especially in large sizes.
After some timid attempts since version 3.2.0, darktable has now been officially ported to Windows (64-bit only).
You can download it darktable 4.4 from here, where you will also find the new 116MB download entitled "darktable-4.4.0-win64.exe" for Windows.