I mostly just use my regular Barclays and Hilton apps, but I'm getting some good ideas from this forum. I am familiar with some of the third-party apps, I just have not tried to use them.
I used to register my programs with Points.com . One issue is it may not accept all programs but overall it worked great for me. I could transfer points from one program to another and also with other users of Points.com. I mainly used it as I could get Best Western gift cards from my Frontier points but I don't do Frontier anymore so I haven't visited the site in awhile. You may want to check it out as it may be useful for you.
Thanks for the info @sbeauty0126. Yes, my main challenge, too, was finding something that accepts all of my reward programs. So, I finally bit the bullet and created a spreadsheet last week. But I will check out the points.com