Reviewed in Form+Function
If your phone is running out of memory and you're on a mission to destroy space hoggers, The Cleaner might help. Easy to use and themable, the app analyses your phone and frees up storage. Do check through the list of suggested deletions though, lest you delete all your photos; a couple of Play Store reviewers can attest to that.
Pockets6794: Kind of like clean master before it started sucking.