BETA IN TOUCH TEACHER aims to help teachers stay in touch with parents, in a light touch way. (Ben Stern describes this challenge here). Software developer Brice Wilson built it; his wife runs their startup. (Looks like the marriage is surviving the collaboration--no mere feat!) The tool aims to let teachers swiftly create an account and sign up a class. Data is private. Teachers have to explicitly invite parents to take part. Available in (free) beta.
