Ready-Made ITSM Tool Needed

I need a fully-featured, production-ready ITSM application that comes with complete, editable source code. My immediate objective is to deploy it on a Windows environment, backed by SQL Server, so those two items are non-negotiable... (Budget: ₹1500 - ₹12500 INR, Jobs: Asset Management, Change Management, Database Management, Documentation, Installation, Software Development, System Administration, Technical Support)