Invoice 1! Plus (formerly Faktura Express) is a free invoicing software provided by TGSoft. The functions of the program, as for a free application, are relatively extensive and include the possibility of issuing sales documents (VAT invoices, receipts, corrections, pro forma), maintaining assortment files and a dictionary of contractors, as well as the option of saving invoices to the so-called buffer (in order to later issue them to the customer).

The program allows you to work in a network, and operators can create several documents simultaneously. On the basis of issued documents, sales summaries are generated according to several criteria. The program has a built-in Report Generator, which can be used to modify printouts or add new ones, including graphic designs of invoices.

The latest version has been enriched with several additional functions, such as settlements with counterparties (control of receivables and liabilities), Cash and Bank Reports and cooperation with fiscal printers. The program also includes a module !Super Print for bank transfers. There is also a poorer version of the application available on the manufacturer's website - Invoice 1!