De Opmaat Audio Free [upd]

If your local library doesn’t have the CDs, they can often request the physical audio CDs from another library for a small fee (often €0 to €2). Once you have the physical CD, you can rip the MP3 files to your computer for personal, offline use. This is legal under "private copying" laws in the Netherlands.

is not a standalone software or open-source library, but refers to the digital listening materials associated with De Opmaat: naar NT2-niveau A2 De Opmaat Audio Free