Out of Milk is one, not sure privacy wise though. there’s an ‘Do Not Sell or Share My Personal Info & Limit Use of My Sensitive Personal Info’ button down, but who knows how much they respect that.
Otherwise, I’ve used it a couple times with my roommate and it works well for listing products and synchronizing between devices. The interface is really simple and it even lets you scan barcodes
There seems to be some on OpenSubtitles .org
have you looked at the megathread in the sidebar? There’s a subtitle section under “Movies & TV”