We are looking for other similar cooperatives with whom we might be able to collaborate, each doing what we're good at. If you know of more, please contact us with details.

Bristol Wireless Community Cooperative
A co-operative set up to develop a free-to-access broadband intranet using radio, with the emphasis on supplying ICT (Information and Communication Technologies) that are relevant, permanent and affordable to communities that find themselves on the wrong side of the digital divide.
Gnutiken
Workers cooperative formed in 2009, selling free software hardware and support in Gothenburg, Sweden.
Bristol IT Co-Op
Workers cooperative formed in 2000. Maybe currently idle.
The Creative Coop
The world needs BIG Social Ideas. We trade in ideas that we believe in. We work with social entrepreneurs who need help telling their story. At the Creative Coop we know that the more people get your idea, the more likely you are to maximise it's social impact. With this in mind, we create communication tools to suit projects of all stages of growth, whether your idea be ready for branding and rollout or fresh off the back of an envelope.
The Tech Co-op
Vancouver BC Canada. Seems to offer similar services to software.coop - local support, hosting and web application development. Seems to have both consumer and worker members. They have a unique focus on Common Lisp.
The Open Co-op
It seems a grand plan, but I'm confused about what sort of cooperative they are and what they do.

Cooperative Development Bodies

The following are not tech cooperatives but could help new ones to start

Non-cooperatives

The following are not cooperatives but may be interesting too.

M6-IT CIC
Community Interest Company with an office in Bristol, offering services only to social enterprises.
Chester County InterLink (CCIL)
All-volunteer, non-profit 501(c)(3) organization founded in 1993 by Jordan Seidel and Eric Raymond.

If all else fails, search these. Remember: most of what the big search engines call "co-op search" is not a search for co-ops!