Air Force Operational Test and Evaluation Center (AFOTEC) - Organization Mission Statement: Reduce risk to warfighter and reduce lifecycle costs through early and continuous involvement and evaluation during the software acquisition process.
International Institute for Software Testing (IIST) - IST is an educational and professional development organization with the goal of promoting a disciplined approach to software testing and cautioning against ad hoc testing by non-qualified individuals and groups. Links to numerous training opportunities here.
International Software Testing Institute - The Institute was founded in order to represent software testers; system testers and quality engineers, and to further the development testing. As our mission statement says, we are committed to excellence in Software Testing. To achieve this, we offer the facility to join a group of like-minded people, who can help each other, and help influence the future of testing around the world.
International Test & Evaluation Association (ITEA) - The International Test and Evaluation Association (ITEA), is a not-for-profit educational organization founded in 1980 to further the exchange of technical information in the field of test and evaluation.
Reifer Consultants, Inc. - From their web site:
"Since its founding in 1980, RCI has become one of the most respected names in software engineering and management consulting. International in scope, RCI is functions as a change agent to help its clients introduce change and make process improvements."
Software Testing Institute - Software Testing Institute gives you privileged access to quality industry publications, research and online services that give you the expertise you need to work more efficiently and productively. The STI Resource Guide is an excellent information source for testing organizations, publications and other on-line resources.