1. Zhoushan Construction Project Bidding Service Center: It is a bidding agency designated by Zhoushan Municipal Government, providing services such as project bidding, cost consultation and contract management.

2. Zhoushan Construction Engineering Cost Consulting Co., Ltd.: It is a wholly-owned subsidiary of Zhoushan Construction Engineering Bidding Service Center, providing engineering cost consulting, bidding agency and other services.

3. Zhoushan Public Bidding Service Platform: It is a public resource trading platform designated by Zhoushan Municipal Government, providing services such as project bidding, land transfer and government procurement.

4. Zhoushan Construction Engineering Consulting Co., Ltd.: It is a professional construction engineering consulting company, providing engineering consulting, bidding agency, cost consulting and other services.

5. Zhoushan Hongyuan Engineering Consulting Co., Ltd.: It is a professional engineering consulting company, providing engineering consulting, bidding agency, cost consulting and other services. These are just some platform companies in Zhoushan. You can choose a suitable platform company according to your own needs and actual situation. At the same time, you can also get more information by searching online or consulting local construction industry associations.