I see that KMyMoney has a forecasting section but I haven't looked at it at all, other than to see it was there.
Is its intent to provide a cash flow feature ?

What I am looking for and it might not be in KMyMoney is a product to answer the question:
Do I have enough to retire, or if I retire now, when will I run out.
I know that there are some freebie on-line products and I will give them another look.
Quicken had one that I somewhat depended on even though it disagreed with another but yet agreed with a 3rd.

Are there any that y'all recommend ?

Thanks

As you said, KMyMoney's forecast feature provides an insight into cash flow, and it's not a retirement planner.

I have only used MS Money myself, which is now deprecated, so I can't point you to a good one.