Lincoln St/Burncoat area
I don't know if it still goes on but there used to be some solid pickup games either Sat or Sun mornings up at the gym at Quinsigamond Community College. Pretty sure those still go on.
Another place that is a bit of a hike but had some really solid games was the Greendale Y.
In regards to outdoor courts, you could go down to the Valley. Although, it can be a rough neighborhood.