I haven't used my original Max in quite some time as I prefer my Note Pro for its light and dual touch capabilities. My wife uses the Max now to read manga and she quite enjoys it for that.
When I did use it, the main apps I used were: FX File Explorer, Moon + Reader, ColorDict and several Chinese and Japanese dictionary apps. I also had an old version of Kingsoft which I sometimes used.
To find older versions of apps, APKPure can be a useful site:
https://apkpure.com/app