Organizations
Compsoc.org.uk - http://www.compsoc.org.uk/
UK cooperative site that brings together internet and computer based societies in the UK.
IEEE Technical Council on Software Engineering - http://frakes.cs.vt.edu/tcsereuse.html
The IEEE Technical Council on Software Engineering is focused on software reuse and provides articles on the subject.
Python Software Foundation - http://www.python.org/psf/
Promotes the use of the Python programming language and open source relating to this.