Happy Memorial Day weekend!
I just wanted to share this app I built that allows hikers to generate their own mileage tables and custom elevation profiles for any section of the AT (NOBO or SOBO).
https://bentwells.shinyapps.io/atdata/
It's not nearly as fancy as Guthooks, but it's free. The data are all based on the 2018 edition of WhiteBlaze pages. I worked with the author, Rick, to make sure everything is accurate.
It doesn't have any town/service info, so it's not meant to replace the guide book - but you can export the info to a PDF and print it to save weight.
One caution: I am currently using a free service to host the app. The drawback is the free service limits each app to 25 hours of user time (total amongst all users) per month. After that it gets shut down for the rest of the month. I would have to use their paid service to get more user time. So, if you like the app, please consider donating so more people can use it.