PowerPhotos works with the built-in Photos app on your Mac, providing an array of tools to help you get your photo collection in order.

Features:

Create and manage multiple libraries
Instead of being limited to putting all your photos in a single library, PowerPhotos can work with multiple Photos libraries, giving you many more options for how to organize your ever growing photo collection.
Splitting your photos between multiple libraries helps Photos open more quickly, lets you archive older photos, store some of your collection on an external hard drive, and reduce storage space used by iCloud Photo Library.

Copy photos and their metadata
You can split your library by copying albums and photos with a simple drag and drop. PowerPhotos will take care of copying the photos and retaining their metadata, including keywords, descriptions, titles, dates, and favorite status.

Merge Photos libraries
Got a whole bunch of libraries you want to consolidate into one? PowerPhotos lets you merge your libraries together while weeding out duplicate photos in the process. You will be shown a preview of what your merged library will look like before any modifications are done, to ensure your merged library looks how you want.

Find duplicate photos
It's easy to have multiple copies of the same photo creep into your photo collection over time. Use PowerPhotos to find duplicate photos in one or more libraries, view them side by side, and separate them into albums where you can easily delete them from your library.

Browse and search
Use PowerPhotos' image browser to quickly view your photos without having to open Photos itself. View detailed photo information using List View, and search for photos across all your libraries at once.

Migrate your iPhoto/Aperture libraries
If you have a lot of existing iPhoto or Aperture libraries that you want to migrate over to Photos, PowerPhotos will help automate your migrations so you don't have to spend time babysitting this lengthy process.

Limitations: Unregistered version limits to finding not marking of duplicates for deletion, copying 20 photos at a time versus unlimited, preview of merge libraries, and when migrating libraries reduces them from unlimited to 2.

Versions:
• Download is for current version
• Version 1.8.5 for macOS 10.14
• Version 1.6.4 for macOS 10.13
• Version 1.4.2 for macOS 10.12
• Version 1.2.3 for OS X 10.11
• Version 1.0.6 for OS X 10.10

Requirements:
macOS 10.15+
Universal Binary