Divers hands

Divers hands (or more rarely dyvers hands), is an archaic phrase used to refer to a project that has been contributed to by many people. "Divers" is a word of Latin origin ("diversus") that is still commonly used in modern French language; it literally means "many and varied". This usage of the word "Divers" can be found in the Bible and other older texts, but it is not commonly used in modern English. The phrase is still used to refer to the authorship of plays, essay collections, and short story collections by multiple authors.
Divers hands in the past.
The oldest usage of the term to date online is William Strachey A True Reportory of the Wrack (1610) "Fowl there is great store, small birds, sparrows fat and plump like a bunting, bigger than ours, robins of divers colors green and yellow, ordinary and familiar in our cabins, and, other of less sort;" 
There does not appear to be the use of 'divers hands' in the English bible itself, but often in scholarly works about the bible. There are several uses of the word 'divers', however. For example, in the King James version of the Bible, "And Tamar put ashes on her head, and rent her garment of "divers colours" that was on her, and laid her hand on her head, and went on crying."
The very rare alternative spelling 'dyvers hands' was historically used, for instance in the parish records of St John in Bedwardine, Worcestershire, England "that 'thro' dyvers hands it came to Mr. Thomas Hall of Henwyke, the father of John Hall."
Divers hands and the Cthulhu Mythos.
The most common modern-day usage of "divers hands" is found in the stories of the Cthulhu Mythos, created by H. P. Lovecraft and expanded by other authors. How the term originated and why it regularly came to be used to refer to Cthulhu Mythos stories is unknown. It was originated either by Lovecraft himself or by his protégé August Derleth, who first published many of Lovecraft's works.
Derleth's publishing company, Arkham House, was the first to codify this usage with their publication of "The Shuttered House and Other Rooms" (1959), and later "The Dark Brotherhood and Other Pieces" (1966). Each was bylined "H. P. Lovecraft and Divers Hands", and each included original stories and poems by H. P. Lovecraft as well as derivative works and essays by other notables, including Fritz Leiber and Jack L. Chalker.
The phrase can be found in reference to many of the original weird fiction writers, including not just Lovecraft but also Clark Ashton Smith. It has also been used in many modern collections, such as the "Call of Cthulhu" books.
Divers hands today.
The most common non-Chthulhu Mythos usage of the term 'divers hands' is "By (someone's real name) and Divers Hands", which tells people that the principal author wants to give credit to all the others who contributed. Example:
The second most common usage of 'divers hands' is when you need to list name an author in an alphabetic list and when there isn't any author's name, use 'divers hands'. 
Otherwise, most of the usage seen for 'divers hands' is in literary criticism, for instance: