CK-ERP is an open source accounting / MRP / ERP / CRM system that runs on top of multiple middlewares. It provides accounting and back office functionalities to SMEs and utilizes the underlying middleware to administer accounts/groups.

It comprises 22 modules - Administration, Multilingual Facility, Contact Management, Customer Relationship, Customer Self Service, Vendor Relationship, Material Requirement Planning, Warehouse, Inventory, Service, Accounting Ledger, Bank Reconciliation, Accounts Payable, Accounts Receivable, Purchase Order, Sales Order, Quotation, POS for Cashier, POS for Manager, Human Resources, Staff Self Service and Payroll.

Operating platform can either be LAMP or LAPP. Backend database engine can be anyone of MySQL, PostgreSQL and SQLite.