This is a repository of tools on the internet that boast decent credentials and usage numbers, offering game improvement advice to players.

Most popular and commonly used tool for League of Legends. Provides a history of games, and statistics on previous matches. Aggregates data for champion usage over the course of a season. This tool is commonly used to scout opponents and information about their champion usage.
Games supported: League of Legends, Overwatch, PUBG, and Fortnite.
<aside> 💡 Note: This is a live page and is constantly being updated with information!
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A rather new website that combines the features of op.gg, champion.gg, and personal coaches. Provides feedback at the end of a game, converting numbers and statistics into digestible insights. Aimed more at a low-mid elo players.

Games supported: League of Legends, TFT, Legends of Runeterra, and Valorant.
Similar to the previous two tools. What makes this unique is its subscription based 'BOOST' service. This gives access to game plans for live matches, and a rich combo database. Trying to target players from lower elo, and offer game advice.
Games supported: League of Legends and TFT.