Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
Event Hunt - Startups and Tech Events Curated By Locals
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Axure RP - The prototyping and specification software used by 87% of the Fortune 100. Beyond mockups, design interactive prototypes for business solutions, websites, and applications.