Step 1: Recall the software.
"Sanchaya" is an e-governance software developed for Kerala's local self-government institutions such as gram panchayats, municipalities, and corporations.
Step 2: Identify its primary function.
Sanchaya is specifically designed to automate and manage tax and non-tax revenue collection in local bodies, streamlining demand notices, receipts, and arrear tracking.
Step 3: Confirm the answer.
The Sanchaya software in Kerala is related to tax and revenue management in local bodies. \[ \boxed{\text{tax and revenue management in local bodies}} \]