Web Enabled Management, Marketing, Billing etc. for a Web Development Company

We are looking for a web enabled way to manage various functionalities of a Web Development Company. Features will include the following : i) Billing for customers ii) Reminder to be sent to the company for domain and server expiry periods for any specified client iii) Multiple user login with different rights (read/write/edit) iv) Option to store passwords v) Option to keep all the details of the server given to a client (features of the server) vi) Marketing Management System - i.e. to keep all the details of marketing. Details of Various visits and Quotations given to the clients. Reminder for follow up. vii) Total record and balancing of purchase and sell. (i.e records show that yo had 5 GB of saerver and you have already sold 3 GB so only 2 GB are left) If it can calculate the proprtionate cost of the balance 2 Gb based on the time already consumed but not sold, then it will be better. viii) If possible ledger for every client Above is all what I have in my mind immediately. But if you have a readymade system ready (with may be more features) with you then pls forward us a link so that we have have a look at I and may go for it with a few changes if required. I need it ASAP. Thanks for your efforts in advance. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. ## Platform Preferably PHP, MySQL