Community Portal for Professionals

We are looking for a Professional Networking Portal with the following features using Open Source: § Professional networking § Online interactions § Information and Knowledge § Jobs § E-Commerce § Listings For Details, refer the attached document. In your proposal I would like to see, § Your recommended technology options with advantages along with information on other technology options considered. § Development Project Management and Delivery methodology § Timeline and Cost § Any other items you like to clarify Please send me your proposal ASAP. Thanks