Good idea always to have something to plant into freshly turned soil after harvesting.
Catch crops - fast growing carrots, variety of salad veg, beet etc. - will see you through to winter.
Loads of oriental veg are ready to sow now and grow very fast.
You could plant anything after radish and salad, even more radish and salad!
After the spuds come out, you can follow with brassica plants, beans or leeks (not toms or root veg).
Peas can be sown now, either for pods later in the year, or just for pea sprouts - fast crop, out in a trice if you want to plant something else instead, and dee-lish :P
This month you can plant cucumbers and squash in the open too!
And yes, if you're going to leave the soil bare from now to overwinter, a crop of green manure will suppress weeds and keep it active, moist and cosy ::) :)