I have to recommend the journal Constructivist Foundations, edited and maintained by Alex Riegler.
You will find contributions from von Glaserfield, Varela and many others discussing (radical) constructivism, practical realism, pedagogical constructivism, similarities and differences with other philosophical perspectives, among many others.
These approaches offer an alternative philosophical foundation to the cartesian representationist approaches that underpin many cognitivist models of consciousness. A lot of the contributors have a deep interest in the role that language plays in construing our understanding of the world.
The journal is peer-reviewed and of a very high standard, but FREE! All you need to do is register with an email address to gain access to pdf versions of individual papers as well as whole issues.
Click on the cover (Vol.5 No.3) to go to the homepage, and subscribe for free to access current & archived issues and sign up for email alerts for new issues.