FastStone for quick reviewing.
PTGui and GigaPan for pano stitching
PhotoNinja for quick RAW processing
Affinity for any editing
ProShow to make slide AV presentations
PowerDirector for any video work (used to use Vegas Pro until Sony sold up and the pricing went silly)
Ooops just reread title - I don't edit on phone/tablet - those are all desktop programs.
Not sure, I’ve never used Android.looks like it suits apple more than android?