Lunchclub - Curated 1:1 professional connections
Levels.fyi - Compare career levels across software eng and other fields
Caliber - IM for LinkedIn. Instantly chat with your business contacts.
Until - Until lets you create beautiful widgets to count down the days until meaningful events in your life.
No Fluff Jobs - Oferty pracy dla programistów, testerów, specjalistów DevOps, Support, UX, Project Manager, Business Intelligence i innych!
Virus Cafe - Make a friend in 2 minutes