I'm still using Picasa on my late 2013 iMac, still using Mojave because apple told me I will loose Picasa if I update further. Does anyone have any suggestions on good photo program that operates similar to Picasa?

There are several good photo programs available for the Mac that operate similarly to Picasa. Here are some options you could consider:

1. Google Photos: Google Photos is a free, cloud-based photo management app that allows you to upload, store, and organize your photos online. It has features similar to Picasa, such as facial recognition, photo editing tools, and the ability to create albums and share photos with others.
2. Apple Photos: Apple Photos is a built-in photo management app on Macs that is similar to Picasa. It allows you to organize your photos by date, location, and keywords, and also has features such as facial recognition and the ability to create albums and shared albums. It also has some basic editing tools.
3. Adobe Lightroom: Adobe Lightroom is a professional-level photo management and editing software that is available for Macs. It has advanced editing features and the ability to organize your photos by keywords, metadata, and more. It also has integration with Adobe Creative Cloud.
4. ACDSee Photo Studio: ACDSee Photo Studio is a photo management and editing software that has features similar to Picasa. It allows you to organize your photos by date, location, and keywords, and has some basic editing tools. It also has a customizable interface.
5. Photoscape X: Photoscape X is a free photo editing and management software that has features similar to Picasa. It has basic editing tools, the ability to create collages, and organize photos by folder.

Before making a decision, it's recommended to do some research and read reviews to see which program would be the best fit for your needs.

degelmom wrote:

I am desparate to keep Picasa, but it's getting harder and harder to function with it.

FWIW, Google discontinued Picasa in 2016.

See: https://picasa.google.com/