Tutcat, TUT:s library database, has an open API.
More information, including terms of use, are available at https://www.kiwi.fi/pages/viewpage.action?pageId=53839221
Dpub has an OAI-PMH -API for data collection.
TUTCRIS, where researchers can store metadata for their datasets, can be found at https://tutcris.tut.fi/portal/en/datasets/search.html The data is also available at Etsin https://etsin.avointiede.fi/en/
Open teaching material is available in Zenodo that has an OAI-PMH -API at https://zenodo.org/communities/tutlibrary-publicationandresearchsupport/