http://www.tallysoftware.org.
TallyPrime is enhanced to reconcile your books with GSTR-2A, GSTR-2B and GSTR-1 in a seamless way. Simply import the GSTR2B/2A and GSTR-1 statements, TallyPrime will reconcile the data automatically and flag unreconciled invoices with the reason for the mismatch.
