collaborative

Of, relating to, or done by collaboration.

No need to thank me - it was a collaborative effort.

An organized group of people or entities who collaborate towards a particular goal

1895, (no by-line), "In The Halls of Learning: Columbian University", The Evening Times (Washington, DC) (19 October 1895, page 2) -- this appears to be a unique usage; very difficult to find non-adjectival uses prior to the 1970s In the literature class, which is conducted by Prof. George J. Smith, lately of Central High School, and which is a collaborative of Dr. Farquhar's course, the students are pursuing their new course.

Concern over possible conflict between their collaborative and one set up a year ago ....