Hi:
Someone else mentioned Tech Writing. I used to be active in the local chapter of Society For Technical communication. There are a fair number of stay-at-home tech witing jobs. And society meetings are often an excellent place to hook-up with the (typically) small companies that will contract you out.
Be aware, just like BA's tech writing requires extensive end-user and other SMA contact. Stay-at-home Tech Writing generally really means: professional word processor.
Tony