Blue Chip Economic Indicators
This may be the best known organization for consensus macro forecasts. Their "Blue Chip Economic Indicators" surveys leading business economists and from the interviews, they distribute a 16 page monthly report. It offers forecasts for real GDP and 15 other macro variables. As one might expect, a subscription is expensive -- about $1,000.
The also offer "Blue Chip Financial Forecasts" which offers "the latest in prevailing opinion about the future direction and level of U.S. interest rates." It also has forecasts of some macro data.