You can freeze cooked apple or blanched apple slices ready to use for crumbles or pies in the winter. To blanch them, you peel, core and slice the apples and then drop into simmering water for a couple of minutes. I can't remember if you're supposed to put sugar and/or lemon juice in the water, as it's a long time since I did this - used to do it regularly when we had a bumper crop of cooking apples - so maybe check online for that. Anyway, you lift the blanched slices out of the water and cool on a baking tray, then freeze in airtight tubs or freezer bags in convenient portion sizes.
Apple chutney is a very good idea as it doesn't need to be kept in the freezer or fridge (once you open a jar you might want to keep it in the fridge but not till then). Just make sure you have plenty of jars to put it in before you start! You can keep them in a fairly cool, dark place (e.g. under the bed in an unheated spare room or out in a shed) for the two or three months they need to mature before you can start eating the chutney. That's the traditional approach, anyway. I use a Rose Elliott recipe which doesn't appear to be online. It uses apples, onions, ginger, salt, sugar and vinegar, I think.
This one is fairly similar but doesn't use onions:
Apple and Ginger Chutney
Based on a recipe from The Cranks Recipe Book, we have tweaked it a bit to our liking :)
Ingredients:
750 ml. cider vinegar
675g. molasses cane sugar (or any very dark sugar)
3 bay leaves (make little tears in them)
1 kg. cooking apples, peeled and chopped
100g of fresh root ginger, peeled and finely chopped
6 cloves of garlic, finely chopped or crushed
a little seasalt
Slowly dissolve the sugar in the vinegar in a large pan. Add the bay leaves. Prepare the apples, garlic and ginger and add these also with the salt. Bring to the boil, then turn down to a simmer for 2-3 hours until the excess liquid is gone. Cool and jar.