Open Tax Solver is described as 'OpenTaxSolver (OTS) is a free program for calculating Tax Form entries and tax-owed or refund-due, such as Federal or State personal income taxes' and is an app. There are more than 10 alternatives to Open Tax Solver for a variety of platforms, including Web-based, Windows, iPhone, iPad and Mac apps. The best Open Tax Solver alternative is Intuit TurboTax, which is free. Other great apps like Open Tax Solver are TaxACT, Good Calculators, WageFiling.com and FreeTaxUSA.