Modern banking software solutions inhibit core technology architecture that makes them highly cost-efficient. There are also some free banking software or certain banking software solutions that provide free trials of their services, such as Holvi, OpenCBS, SecurePaymentz, etc. If you need free and open source banking software, try solutions like MyBanco. For industry-grade banking solutions such as TurnKey Lender, Temenous Transact, Bankware, Mambu, Probanx CorePlus, Finacle, etc., you need to contact the vendors for pricing estimates and quotes.