eBid Systems 
BidServer, enables paperless purchasing and contracting. Government agencies, contractors, engineers, and manufacturers can achieve dramatic savings with an internet procurement system.
http://www.ebidsystems.com/ASPTIP
An application software provider packages available to the construction industry. Analysis of each vendor package.
http://www.asptip.com
Construction Applications Servers
Providing the PL E Program Management Application (PMA). The PMA is designed to be a single point data warehouse that contains information most often used by program managers during the course of construction projects.
http://www.ple-communications.com/
Heating and Air Conditioning Information Service
If you need to learn about heating, air conditioning or ventilation, this is the site. Ask our professionals.
http://HVAC-Talk.com
ACEN - The Construction Internet
ACEN is a network of design, engineering, architectural, interior decorating, construction, supplier, contracting, developer, real estate and municipal construction experts. ACEN Exchanges and ACEN Directory of Construction Experts are a resource for our Members.
http://www.acen.com/default.asp
