Seed-DB - Large list of seed-level accelerators that feeds off the crunchbase API. See which accelerators are accepting applications here.
MassChallenge - Massachusetts-based non-profit accelerator. What's interesting is they don't take an equity stake in your company.
Founders Institute - Through our part-time entrepreneur training program, you can launch a company with guidance and feedback from experienced startup CEOs - while not being required to quit your job.
Coworking in Philly - Self explanitory
Coworking in Philly - StartupPHL - A comprehensive list of locations and prices.
Lean Startup Machine - Lean Startup Machine is a workshop & educational series that focuses on teaching some of the principles discussed in Eric Ries's book, The Lean Startup.
Startup Weekend - Startup Weekend is a global network of passionate leaders and entrepreneurs on a mission to inspire, educate, and empower individuals, teams and communities. Startup Weekend travels to cities all over the world.
Penn Apps - One of the top college hackathons in the nation.
Business Model Generation - This book helps you think through the process of building a business model and gives you examples to help. A preview of the book can be found here
The Lean Startup - Read this book.
Hacker News - Awesome site for news especially around the startup community.
Lean Startup Machine Validation Board - The valdiation board allows you to take a problem and a customer and valdiate your basic assumptions associated with your possible problem and solution.
Business Model Canvas - This is a simple way to think through the business model process. This is a companion tool from the Business Model Generation book listed above.
What is A/B Testing - A visual primer on A/B Testing
Learn About Angel/VC Term Sheets - Gabriel Weinberg, founder of Duck Duck Go, describes what you should know about Terms sheets in an easy to digest segment.
Hack Design - Design primer for coders
Keynotopia - Design prototyping tools for software startups.
Powtoon - Create simple animated presentation videos
Balsamiq - Prototyping tools for user-interface designs
Launch Rock - Simple and fast landing page for products. (Good for workshops!)
Foundation - A responsive design template for novice coders to create beautiful websites
Twitter Bootstrap - Another responsive design template
Flat UI - A set of tools for creating flat and colorful websites
Shit for Making Websites - Coding and management tools for making your own website.
Shapeways - 3-D printing resource that allows you create fine 3D models in plastic, metals, and ceramics.