Photofeeler - Choose your profile photos using hard data
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
DATEnhance - upload a couple of pictures, and go on to rate others.
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Snappr Photo Analyzer - AI that tells you if your profile pic is actually any good
Toby - Better Than Bookmarks