- UMN: This problem collection was developed by Jonathon Rogness and Justin Sukiennik at the University of Minnesota, and adds a large and excellent collection of new college algebra and calculus problems to the library.
- NAU: This problem collection was developed by Nandor Sieben at Northern Arizona University. The NAU problem collection contains innovative problems for finite math, discrete math, statistics, college algebra, and calculus.
- CSUOhio: The CSUOhio collection was developed by Barbara Margolius, Felipe Martins and Dan Gries. This collection contains unique problems which incorporate Flash applets to create very interesting problem types not previously available in WeBWorK (or any online homework system, as far as I know).
Recently, three new problem collections have been added to the NPL: