Chess PGN Explorer Pro – Apps on Google Play

Lichess Study: The Only Guide You'll Ever Need - The School Of Rook

* Chess game search engine

Chess Games.com

Know Your Moves Chess Opening Explorer

GitHub - yafred/chess-explorer-go: Explore your chess games from multiple sources

GitHub - felaube/chess-games-explorer: A web application that allows a chess player to see a history of all the positions he reached in his games played at chess.com or lichess.com

Chessgames.com - Wikiwand

Visit 365chess.com - Chess Games Database Online - 365Chess.com.

Microsoft Prepping Windows 8 App Store?

Opening repertoire study with spaced repetition (+ database and game collections) : r/chess