Cogni is an Android app that can list the installed apps on a phone by the frequency of usage. I developed it for fun only as my first mobile app. It uses mathematical formulas to list the most relevant apps first. Relevance is computed from frequency and recency of usage, time and day. Later, I plan to include GPS location and other attributes to the relevance function.
Warning: Do not use it for serious work. It is a rudimentary app and designed for testing.