Gradescope helps you seamlessly administer and grade all of your assessments, whether online or in-class. Save time grading and get a clear picture of how your students are doing. Gradescope supports variable-length assignments (problem sets & projects) as well as fixed-template assignments (worksheets, quizzes, bubble sheets, and exams).
Gradescope is available in a Blackboard course by going to any content area (like Course Content) then Build Content.
Help and support for Gradescope is available from the company at https://help.gradescope.com
Blackboard integration (look for the LTI 1.0 instructions for Original courses)