MoreGamesLike.com - Most popular recommendation engine for more similar games and recommendation blog.
Alternato - NOTE: Not available in English.
Open Source Game Clones - This site tries to gather open-source reimplementations of great old games in one place.
AlternativePedia - Discover free, open source or simply better alternatives for your software based on our research...
Alternatives By TechnoFizi - Find all major games, apps, sites, software alternatives
Aventrix - Aventrix is a website that helps you discover new and fun activities.