1) TallyPrime 2) NSDL Centre(PAN & TAN) 3) DSC(Dig...

1) TallyPrime
2) NSDL Centre(PAN & TAN)
3) DSC(Digital Signature Certificate)
4) CredFlow(Tally on Mobile)

https://app.credflow.in/register?referal=M6EWFP
http://www.tallysoftware.org.