Startup Entrepreneurs is described as 'A club to support entrepreneurs'. There are four alternatives to Startup Entrepreneurs for a variety of platforms, including Online / Web-based, Windows, Android, Android Tablet and iPad. The best alternative is Startup College. It's not free, so if you're looking for a free alternative, you could try Fridge Magazine or Startup Timelines.
A service provided by URL2PNG , Startup Timelines delivers illustrative timelines showing the evolution of various startup websites/web apps with the goal of indexing and tracking every startup ever made.