Just to clarify - Turnitin, Ouriginal (Urkund), Compilatio, Strike, Unicheck (unplag) all support the core Assignment, Workshop, Forum activities and possibly some of the other plugins also support them.
Turnitin, Ouriginal and Unicheck have just added support for Quiz essay questions in 3.11 and higher too. (older Moodle releases are also supported with a patch.)
Turnitin, Ouriginal and Unicheck have just added support for Quiz essay questions in 3.11 and higher too. (older Moodle releases are also supported with a patch.)