Institute of Electrical Engineers Essex Centre
- Listings of events, speakers and officers. Branches in Hadleigh, Chelmsford and Brentwood.
- http://local.iee.org/essex/

Essex Chambers of Commerce
- Representational voice of the Essex business community. Local chambers in North Essex, Mid Essex, South Essex and Basildon.
- http://www.essexchambers.co.uk/