Here are apps I use on my android devices which include phones. You can either 'Save As' directly to your pc or choose a 'Save' method.
I don't recommend changing the original file name without making a copy first.
Put the app in your mobile device (preferably in a folder you created there) and click it to start the installation processes.
None of these apps have been created by me unless stated and all are freeware.
Use at your own risk.
Some are system apps and may corrupt your android system. Check you don't already have an app listed here before installing it.
Apologies for not having this all in alphabetical order.