These are lovely, thank you all.
On the second half of my question — please, if you know a group actually functioning in your city, do post them. I would rather this thread turned into a list of who is genuinely operating than a list of who has a nice Instagram, so: only if you have personally dealt with them, and please say what you dealt with them for. Fostering, TNR, medical, transport — most groups are good at one thing and stretched on everything else.
And a plea from the other side: if you are adopting, please answer the messages. We do home checks and follow-ups and about half the people who fill in a form vanish. Every one of those is a foster place we held open.