BPD World http://www.bpdworld.org/
A forum and various other online support channels provide support for persons with and without BPD. Offers a volunteer-run UK-based help and info line. Advice from professionals is available for paying members only.
BPD411 http://www.bpd411.org/
Community of NonBPs standing up against Borderline Personality Disorder, recognizing the trauma they experienced, and finding the road to healing and recovery after the relationship. A separate mailing list exists for those who have the daunting challenge of parenting a minor or adult child with BPD.
DBT Self Help http://www.dbtselfhelp.com/
Information about all aspects of Dialectical Behaviour Therapy: from handouts and worksheets, to lessons, and research articles.
Middle Path http://www.middle-path.org/
A nonprofit aimed filling the needs of those recovering from BPD by providing a variety of peer support and recovery education initiatives. The organization is run by graduates of DBT programs, in partnership with mental health professionals.