HSReplay

HSReplay is a community-run website owned and hosted by HearthSim. It is an analysis website notable for the replay feature, allowing players to watch their games back, and the tracking of meta decks. They also offer deck tracker software called Hearthstone Deck Tracker.

Replays
Players and users can download Hearthstone Deck Tracker to track and record their games. This allows for analysis and sharing of plays.

Meta analysis
As Hearthstone Deck Tracker tracks every user's deck, winrate, and card usage, it has managed to develop a database of the most played, and best performing, decks and cards.