Trading Economics – My preferred source for economic calendars and also allows to easily view the data across many months for comparison/charting.

Estimize – Estimize is a platform for a better consensus number for economic and earnings forecasts and provides a nicely laid out calendar.

Bio-Pharma Catalyst – A convenient calendar for keeping track of upcoming Biotech/Pharma catalysts.

Wall Street Horizon – The gold standard in providing the full event schedules including Conferences and Analyst/Investor Days.