Open Question: Phone and online help lines for other countries?

Hey I'm writing a story that deals with some heavy topics (rape, abuse, self-harm) and I would really like to put an author's note at the end of the story that encourages anyone dealing with issues like these to talk to someone. Then I'd like to list some free-call numbers for help lines where they can discuss with someone anonymously, but I only know the ones for Australia. So if anyone can tell me the help line number (or online chat) for their country (especially Great Britain and the US) I would really appreciate it.