Readymade ERP Application for Quotation/Billing/Accounting/Purchase Management

I'm in search of a ERP Application with with Quotation/Billing/Accounting/Purchase Management.

Key Modules Required:
- Quotation
- Purchase
- Project Management
- Materials Management
- Stock/Inventory
- Billing
- Accounts
- Reports
- Project Management
- Cost Estimation
- Procurement

Specific Features for Project Management:
- Task Management: The system should allow for easy task assignment and monitoring.
- Resource Allocation: It should have a robust system for allocating and tracking resources.

Specific Requirements for Cost Estimation:
- Integrated Cost Database: The system should have a vast and well-organized cost database.
- Calculation Formulas: It should accommodate complex estimation formulas.
- Reporting and Analytics: The ability to generate detailed reports and analytics is crucial.

Ideal Candidate:
- Should have a strong background in PHP development.
- Extensive experience in developing ERP solutions, particularly for construction.
- Knowledge of project management and cost estimation methodologies.
- Ability to think critically and solve complex problems.
- Good communication skills and ability to work in a collaborative environment.