Important documents addressing human rights issues, with particular emphasis upon freedom of religion or belief in Europe, may be found at the following links:

Religion and Law Consortium (Religlaw)

Organization for Security and Co-operation in Europe (OSCE)

Office for Democratic Institutions and Human Rights (ODIHR)

Tandis (Tolerance and Non-Discrimination Information System, OSCE/ODIHR)

Tandis FORB documents

The Venice Commission (of the Council of Europe)  The following links to the website of the Venice Commission (CoE) are particularly useful for research:

Venice Commission Human Rights Documents

Venice Commission Documents by Series (with key to the Commission document designations)