Any free software to sim unlock iPhone 7?

Really want to unlock iPhone 7 but no money to go do it. Any software to do it at home free?

No

No. If you own the iPhone 7 and you have paid off the phone through the contract, then you can usually get it unlocked for free.
Go to your carriers website who may provide more information

It's not possible.

All legitimate businesses which offer unlocking can only do so by applying directly to Apple for an unlocking code. The only other way is to take the risk of getting it done by jailbreaking the phone, but that carries risks not least of which is that the shadier phone unlocking booths don't worry about little things like copying your IMEI and snooping around so that others can clone your phone or steal your personal details and piggyback onto your data connection.