Steam Database is described as 'A third-party tool was made to give better insight into the applications and packages that Steam has in its database' and is an website in the News & Books category. There are six alternatives to Steam Database, not only websites but also apps for . The best alternative is GG.DEALS, which is free. Other great sites and apps similar to Steam Database are Steam Charts (Free), Steam Spy (Freemium), VG Insights (Freemium) and hypetraq (Free).
Very good and clear site for best deals. You can search for current best discounts for a game, set price alerts, looks for historical low prices across multiple stores (not just one) etc. Very customizable alerts.
Steam Spy is Steam stats service based on Web API provided by Valve and cool idea of Kyle Orland from Ars Technica. Steam Spy automatically gathers data from Steam user profiles, analyzes it and presents in simple, yet beautiful, manner.