Do you know whether and.co has standard contracts / clauses for open source work? My concern is that open source would be legally tricky because of consideration (https://en.wikipedia.org/wiki/Consideration). Essentially, they are getting nothing of value in exchange for giving me something.
I don't recall a specific template option for open source, however I have previously amended the contract to add a clause that any open source contributions I make in the course of a project will remain open source