Put the solar system in your pocket! Orrery is an astronomy/astrology app that lets you crank through time to see accurate projections of where planets were or will be on specific dates.
4GamesList is the best free alternative to Backloggd — like AniList, Letterboxd, or MyAnimeList but for video games. Track your game library, log playtime, sync Steam achievements and PSN trophies, browse game characters and studios, and connect with friends.