(1) Silicon Valley: What are the top 20 Startup accelerators in Silicon Valley. L'Atelier - San Francisco. Blowing Up Startups Since 2010. AngelPad – Start a company! « AngelPad* AlphaLab — Pittsburgh's Startup Accelerator. Brandery. Helping great people build great companies. Techwildcatters //Techwildcatters. KickLabs - Kicklabs: home to some of the best start-ups in digital media. LaunchBox Digital - Seed Investment and Accelerator Program. Chicago Startups: Incubating and Accelerating. Y Combinator. TechStars.