Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Sass - Syntatically Awesome Style Sheets
Event Hunt - Startups and Tech Events Curated By Locals
PostCSS - Increase code readability. Add vendor prefixes to CSS rules using values from Can I Use. Autoprefixer will use the data based on current browser popularity and property support to apply prefixes for you.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Stylus - EXPRESSIVE, DYNAMIC, ROBUST CSS