Contracts and policy documents until 2018 can be found on the predecessor of this page on the server of the taz, Berlin: https://migration-control.taz.de/#en/background/treaties
A constantly updated collection of EU documents can be found in a database at Statewatch.
Companies, organisations and projects that benefit from the upgrading of borders: Open Security Data Europe
A list of bilateral EU treaties can be found in the European Encyclopedia of Law.
Documentation of the imprisonment of Migtants* worldwide with continuous updates can be found on the website of the Global Detention Project, Geneva: https://www.globaldetentionproject.org/
European policy documents are continuously documented and analysed on the Statewatch website: https://www.statewatch.org/
Continuous Press Documentation:
News on the site of ERCE: https://www.ecre.org/news/news/
ECRE Weekly Bulletin: https://www.ecre.org/media/ecre-weekly-bulletin/
Migration-Control Monthly Review: https://migration-control.info/blog/