Not fully scrubbed up yet but they're a start.
Ask My Buddy
http://www.askmybuddy.net/ keeps a list of contacts that it will alert if the user activates it via Alexa.
Debby Onsite
https://www.alexaskillstore.com/Debby-Onsite/23550 lets the user store and then retrieve reminders about the location of something. It can also be manipulated into saying what an alarm or a timer mean although that's a bit clumsy. Might be better than nothing though.
Ear Play
https://ear-play.com/ lets the user listen to and participate in stories by making choices about what characters do. I haven't investigated the catalogue yet so I don't know what's available but I tried the demo. As a tool for keeping a person with cognitive impairments focused and engaged, or simply actively entertaining a person isolated by age or disability, I'd say this has potential. Might need another app with specially written material though.