Short description of SliQ Invoicing and Quoting 1.6.3: SliQ Invoicing and Quoting lets you easily raise and keep track of invoices, credit notes, quotes and customer statements. Use SliQ to track customer payments and monitor cashflow using multiple sales and product reports. Suitable for small to medium-sized businesses, SliQ has multiple invoice template styles and includes a number of template customisation options. Crisp invoices and quotes - print or email using built-in PDF software.